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1   weight 6 ping pongs with another 6 ping pongs. see which side is heavier5.39.217.768 r2 ^7 {6 h' B) s; w4 W* O" T
2   spilt the heavier side ping pongs in half and weight against each otherTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。6 f" S. _5 B/ ], h- r# c
3   weiht either ping pongs one on one then you will know which is the heavy one.