KEVENZ 50-Pack 3-Star Plus 40mm Orange Table Tennis Balls,Advanced Training Ping Pong Balls Packing: 50 counts, the color is white Ball Weight (g): 2.60-2.80 Ball Diameter (mm): 39.5-40.5 Long-Lasting: the impact of not less than 1000 times, no cracks Applicable: Suitable for multi-ball training, schools,Table Tennis Arenabeginners , table tennis robots,and other training balls