Stressfree

1   weight 6 ping pongs with another 6 ping pongs. see which side is heavier5.39.217.77:8898& N7 w; D; ^' H( M9 K$ K
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。: F6 H  k6 f  I6 v( f* o# U
3   weiht either ping pongs one on one then you will know which is the heavy one.