New TSP Three Star, 1 box Table Tennis Ping Pong Balls Training Balls 38mm [Set of 3 boxes] 38mm TSP Three Star table tennis balls, used before the 2000 rule change. Although 38mm balls are not currently used in competition, they generate more spin and speed than the current 40mm balls, so how about them for those who use them for practice? The film around the box is partially torn, but they are unused. "Three Star" is a reliable product used in matches and is a product of the highest standard.