FUN, EASY, ATHLETIC: Sport Stacking is one of fastest growing new sports in the country. Help kids develop motor skills, ambidexterity and agility. STACK FAST: 12 cups, made with high-quality materials and specially designed to minimize friction between cups while sport stacking and reduce stacking time. PRECISION MADE: Patented design, made with high-grade impact material to reduce friction, centerless design to eliminate suction between cups. COMPLETE KIT: Comes with high-precision GX timer, specially designed GX 'Space Chomp' mat for the complete sport stacking experience, along with access to Speed Stacks' online instructions. MULTI-AWARD-WINNER: The only cups endorsed by the World Sport Stacking Association (WSSA). Winner of Family Choice award - The Best in Children and Parenting.