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The basic specs are that balls should be 40 mm in diameter and weigh 2.7 grams. The diameter was increased earlier this decade from 38 mm to 40 mm to slow the game down for audiences
Prior to testing, balls are kept in a room at 23 degrees Celsius and 50 percent relative humidity for at least three days. Bounce is tested by mechanically releasing a ball from 305 mm onto a steel plate and measuring the rebound using a digital camera (240 mm – 260 mm acceptable, figure the COR out yourself). Balls are rolled down a 100 mm long incline at 14 degrees to quantify the ‘veer’. The hardness of the ball is measured using a Zwick tester that pushes a 20 mm pin into the ball
Paddle Palace Robot 989-E
can fire balls to 11 different locations at up to 111 mph at a frequency as high as 95 balls per minute
Prior to testing, balls are kept in a room at 23 degrees Celsius and 50 percent relative humidity for at least three days. Bounce is tested by mechanically releasing a ball from 305 mm onto a steel plate and measuring the rebound using a digital camera (240 mm – 260 mm acceptable, figure the COR out yourself). Balls are rolled down a 100 mm long incline at 14 degrees to quantify the ‘veer’. The hardness of the ball is measured using a Zwick tester that pushes a 20 mm pin into the ball
Paddle Palace Robot 989-E
can fire balls to 11 different locations at up to 111 mph at a frequency as high as 95 balls per minute