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Speed Stacks are specially designed high-tech Sport Stacking cups endorsed by the World Sport Stacking Association (WSSA) for competition. Speed Stacks are the only cups permitted for use in WSSA sanctioned events and each Speed Stacks cup carries the official WSSA approval mark. Speed Stacks, Inc. is the worldwide leader in Sport Stacking (formerly known as Cup Stacking). Sport Stacking is an amazing sport of fitness, agility, concentration and quickness. Thousands of teachers, administrators, and parents along with millions of kids have experienced the benefits of Sport Stacking. Become part of the movement! The Speed Stacks 30 set Sport Pack provides what you need to get your class or club started in Sport Stacking! A big hit with schools and clubs around the country, this Sport Pack includes 30 sets of official Speed Stacks cups, which are approved for use in WSSA competition, six StackMat Pros, and an Online Stacking Curriculum with Video Instruction. Speed Stacks are the only products approved for use in WSSA sanctioned events and each cup carries the official WSSA seal of approval.