SPEED STACKS Sets Pro Series  (Black, Green)

Take Your Stacking To The Next Level, Pro Series 2 cups are endorsed and signed by World Champion William Polly. No center that eliminates air resistance and reduces down stacking time Special high impact material Official WSSA approved equipment Developed in conjunction with the world's top stackers, they include special features and are approved by the WSSA for competition use. Available clear, they also feature the patented Quick Release stem. Speed Stacks are specially designed high-tech Sport Stacking cups endorsed by the World Sport Stacking Association (WSSA) for competition.