KEVEN table tennis balls Purchasing Guidelines KEVENZ table teenis balls is divided into three grades: K1,K2,K3(Pay attention to product identification title)。 1 Applicable user 1.1 Grade K1: Practice ball,suitable for beginer ,or play ping-pong less than one year 1.2 Grade K2: Practice ball,suitable players with skills,playing balls for 1 to 2 years 1.3 Grade K3:Tournament Ball,suitable for player with 3 training years 2 Weight Conformity K1 weight：is 2.5 and 2.6g K2 weight：is 2.6 and 2.67g K3 weight：is 2.67 and 2.77g 3 Bounce Conformity All balls must rebound to a height of not less than 220mm or more than 260mm when dropped from a height of 305mm on to a standard steel block. K1 rebound height:220mm and 240mm K2 rebound height:240mm and 255mm K3 rebound height:>255mm 4 Hardness Regularity K1 The coefficient of variation shall be not greater than 0.1mm K2 The coefficient of variation shall be not greater than 0.08mm k3 The coefficient of variation shall be not greater than 0.06mm
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