The governing body setting the rule is the WSSA ( World Sport Stacking Association ).
The cups are reinforced with several ribs on the inside which separate the cups. And the smooth surface helps to reduce friction. Those cups can accompany with you for a long time.
Made of high quality ABS material, the cup suitable for daily training and competition.
The air holes design on the cup bottom is for air fast flowing to improve the player's performance.
The pattern on the surface is not only for decoration but also for increase the friction between the cup and hands of players.
Bottom diameter: 6.6cm
Mouth diameter: 7.6cm
|Dimension and Weight||
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