• Speed Stacks Pro Series 2x Set with Quick Release Stem & Cup Keeper
• Ultra-fast high impact material
• Center-less design eliminates air resistance and improves stacking time
• The only cups endorsed by the World Sport Stacking Association (WSSA) for competition
• Winner of the Family Choice Award! The "Family Choice Awards" recognize the best in children's and parenting products. Now in its 21st year, the "Family Choice Award” is one of the most coveted, family friendly consumer award programs in the nation.