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1   weight 6 ping pongs with another 6 ping pongs. see which side is heavierTVBNOW 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。* u* o6 k, {6 T9 F& @) S, W
2   spilt the heavier side ping pongs in half and weight against each other
2 k6 N+ U  O* \& z3 U/ u1 b公仔箱論壇3   weiht either ping pongs one on one then you will know which is the heavy one.