Stressfree

1   weight 6 ping pongs with another 6 ping pongs. see which side is heavier
( Y. l" u, y, v( b. C( q9 K2 mtvboxnow.com2   spilt the heavier side ping pongs in half and weight against each other公仔箱論壇8 i0 X; z+ F4 R
3   weiht either ping pongs one on one then you will know which is the heavy one.