Kristian Ferrell
Basketballs are spherical and usually orange with black ribs and a possible logo. They are made from leather (traditional), rubber, or a synthetic composite. The inner bladder is made from butyl rubber and is wrapped in nylon thread. The leather encasing keeps everything together and offers a better grip and shock absorption. The size of a basketball can vary, with youth basketballs measuring 27 inches (69 cm) in circumference and NBA basketballs measuring 29.5 inches (75 cm).
| Characteristics | Values |
|---|---|
| Shape | Spherical |
| Size | 27-30 inches (69-76 cm) in circumference |
| Weight | 8-8.5 PSI |
| Material | Leather, rubber, nylon thread, or synthetic composite |
| Color | Traditionally orange with black ribs, but can vary |
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What You'll Learn
Standard basketball size
Basketballs usually range in size from a few inches in diameter to nearly 2 feet (60 cm) in diameter for training exercises. The size of the basketball depends on the age and gender of the players.
For youth basketball, the older the player, the bigger the size of basketball they will use. A youth basketball could be 27 inches (69 cm) in circumference. Using a basketball that is too big will lead to a less enjoyable experience, as the heavier ball will be harder to catch and control. Training with a ball that is too small can also cause issues, as the trajectory of shots and passes will have to be adapted when using a bigger and heavier ball in matches.
The official ball size for men's high school, college, and professional teams is a size 7 basketball. In the National Basketball Association (NBA), the standard basketball size is 29.5 inches (75 cm) in circumference. In the Women's National Basketball Association (WNBA), the maximum circumference is 28.5 inches (72 cm).
National Collegiate Athletic Association (NCAA) men's basketballs have a maximum circumference of 30 inches (76 cm), while NCAA women's balls have a maximum circumference of 29 inches (74 cm). High school and junior leagues typically use NCAA, NBA, or WNBA-sized balls.
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Basketball materials
Basketballs are made from a variety of materials, with the choice of material often depending on the intended use of the ball. The standard materials used for basketballs are leather, rubber, or synthetic composite materials.
Leather basketballs are made from 100% genuine leather, usually cow leather in the case of professional leagues like the NBA and WNBA. Leather balls are the most expensive type of basketball and are only to be used on indoor hardwood courts. This is because the texture of the leather will roughen and wear down if used on concrete or asphalt surfaces. Leather basketballs have a stiff, hard feel when new, but over time they develop a softer, more appealing 'broken-in' feel.
Rubber basketballs are lined with a rubber covering and are ideal for beginners as they are the cheapest to produce. They are designed for use on concrete surfaces, with the rubber material being able to withstand the rough, sandpaper-like texture of concrete.
Synthetic composite basketballs are covered with artificial or synthetic leather material that is designed to feel like leather. This type of basketball is much cheaper to produce and manufacture than genuine leather balls. As it is synthetic, the material has a uniform feel and does not need to be broken in, maintaining a soft feel even when new.
All basketballs have an inflatable inner bladder, usually made from butyl rubber. This bladder is wrapped in layers of nylon thread to create stability and a more perfect sphere. The specific type of nylon used is nylon 6,6, which is lightweight, has high tensile strength, and resists stretching.
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Leather basketballs
A basketball is a spherical ball used in basketball games. The standard size for a basketball in the NBA is 29.5 inches (75 cm) in circumference, while the WNBA uses a ball with a maximum circumference of 28.5 inches (72 cm). Nearly all basketballs have an inflatable inner rubber bladder, generally wrapped in layers of fibre, and then covered with a surface made from either leather (traditional), rubber, or a synthetic composite.
The leather encases the bladder wrapped in nylon thread, keeping everything together and providing wear resistance. Leather does not hinder the essential properties that the nylon and butyl rubber provide for the ball's function. It offers nearly no resistance to compression, which improves grip on the ball, allowing for better control and shock absorption, protecting the players' hands.
The microstructure of leather is a randomly woven network of collagen fibres, allowing the material to deform slightly under stress and return to its original shape. The specific type of nylon used for basketball manufacturing is nylon 6,6, which is made up of two monomers with six carbons each: adipic acid and hexamethylenediamine. Nylon can form into a fibre and has high tensile strength, making it suitable for wrapping around the ball without snapping under tension.
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Basketball weight
The weight of a basketball is an important specification that can significantly impact how the game is played. A ball that is too light may not bounce correctly and could be affected by external factors like wind. On the other hand, a ball that's too heavy can be difficult to handle and shoot, affecting the players' ability to execute plays effectively. Using balls of consistent weight across competitions ensures a level playing field, allowing the skills of the players to determine the game's outcome.
The official NBA basketball weighs approximately 22 ounces or about 1.4 pounds. It has a circumference of 29.5 inches, and the standard material is leather. The NCAA uses a ball that weighs around 20-22 ounces, with a slightly smaller circumference of 29 inches. The WNBA ball weighs about 18-20 ounces and has a circumference of 28.5 inches, offering a more manageable size and weight for athletes in this league. International basketball, governed by the Fédération Internationale de Basketball (FIBA), utilizes a ball weighing around 20-22 ounces, similar to the NCAA.
For younger players in youth leagues, the basketballs are lighter, weighing between 14-16 ounces with a circumference of about 27.25 to 27.75 inches, making it easier for small hands to grip and shoot. Basketballs can be inflated to achieve the correct weight and pressure. Typically, a standard basketball should be inflated to between 7.5 and 8.5 pounds per square inch (PSI). Over or underinflating the ball can lead to erratic bounce behaviour, making it challenging to dribble, pass, or shoot effectively.
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Basketball colour
Basketballs are typically orange in colour with black ribs or lines and sometimes a logo. However, basketballs are sold in various colours. A well-known variation is a basketball with red, white, and blue colours, which was used for the American Basketball Association, the Harlem Globetrotters, and the "money ball" in the NBA All-Star Weekend's Three-Point Contest.
The orange colour is the result of silicone dying. Basketballs are also sometimes painted, as seen in the manufacturing process of some NBA balls.
The colour of the basketball may depend on its intended use. Balls designated for indoor use are generally made of leather or absorbent composites, whereas balls for all-surface use are typically made of rubber or durable composite materials.
The use of colour in basketballs is not just limited to the exterior surface. The black lines on NBA basketballs, for example, are the colour of the interior balloon, not painted on over the skin.
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Frequently asked questions
A basketball is a spherical ball used in basketball games. The traditional colour scheme is an orange surface with black "ribs" and a possible logo, but basketballs are sold in various colours.
Basketballs have an inflatable inner rubber bladder, which is wrapped in thousands of metres of nylon thread to create stability and a more perfect sphere. The bladder wrapped in nylon thread is then encased in leather.
The pros in the WNBA and NBA use genuine cow leather for their basketballs.
The "ribs" are recessed below the surface of the ball in a variety of configurations and are generally a contrasting colour.
Basketballs usually range in size from a few inches in diameter to nearly 2 feet in diameter for training exercises. The standard size for a basketball in the NBA is 29.5 inches (75 cm) in circumference, and 28.5 inches (72 cm) for the WNBA.
