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www.reference.com/article/tennis-balls-made-465edc4e091bf50d

Tennis balls are made out of a hollow rubber core covered by a wool or nylon shell. In addition, the air inside the rubber core is pressurized so that the ball bounces evenly.

www.reference.com/article/size-tennis-ball-d70929d89c2bd15e

An official tennis ball is between 2.575 inches and 2.7 inches in diameter as defined by the International Tennis Federation. Tennis balls also must conform to other criteria if they are to be used in regulation play.

www.reference.com/article/mass-tennis-ball-2ff64f726e277acc

The mass of a standard tennis ball is .057 kilograms. Mass is the measurement indicating the amount of matter in an object.

www.reference.com/article/diameter-tennis-ball-c972fc9f6916a294

The official diameter of a tennis ball according to the International Tennis Federation must be between 2.575 and 2.7 inches. Tennis balls are sold in cylinders containing three per package.

www.reference.com/article/used-tennis-ball-machines-fecbf8d3cea6d3a2

Look for used tennis ball machines on eBay and Amazon.com as of 2015. These sites also offer accessories for tennis ball machines, such as wireless remote controls or storage covers.

www.reference.com/article/first-person-shooter-games-1cf4db5e9b916fe

Some first-person shooter video games are "Half-Life," "GoldenEye 007," "Bioshock," "Doom" and "Halo: Combat Evolved." First-person shooters are a weapon-based sub-genre of action games in which a player experiences the game through the point of view of the game's main ...

www.reference.com/article/space-shooter-games-eb1b3d6788b4eec5

Some of the most popular space shooter games are "Star Citizen," Elite Dangerous" and "No Man's Sky." While "Elite Dangerous" and "No Man's Sky" are completed games that receive frequent updates, "Star Citizen" is considered an early access game, which people can buy an...