How fast can you stack? A great game to play solo, against the clock or go head-to head against friends. Cup Stacking is an exciting individual or team sport to race to stack and unstack 12 competition stacking cups. These cups are approved for use in the WSSA competitions. This exciting sport concentrates on hand-eye coordination, focus, rhythm, ambidexterity and bilateral proficiency. This competitive sport can be taken anywhere. Speed Stacks StackPack Speed Stacks competition kit Inspires hand eye coordination and competition Sport that can be enjoyed anywhere Convenient to bring along for impromptu competition Includes: Timer, 12 official Speed Stacks cups and instructional DVD Durable plastic construction