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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。; a  ?0 \( D, v" X' A
2   spilt the heavier side ping pongs in half and weight against each other
3 N, w. I8 u, u+ U2 u- x; ttvb now,tvbnow,bttvb3   weiht either ping pongs one on one then you will know which is the heavy one.