Hey there! Ready to get your hands moving at lightning speed? This Speed Stacks Glow StackPack is what you need for some serious fun. Sport stacking is basically like a track meet for your hands - you stack these special cups up and down in specific patterns as fast as humanly possible. Whether you're competing against the clock or challenging your friends to see who's the fastest stacker, this set has everything you need to get started. You get 12 glow-in-the-dark competition cups that actually light up your stacking sessions, plus the StackMat Optimum stacking surface with a built-in timer that works even in low light. There's also a handy sport carry bag to take your stacking game anywhere, and a training DVD to help you master those stacking techniques. Perfect for kids, teens, or anyone looking for a fun way to improve hand-eye coordination and have a blast doing it. The cups are designed specifically for competitive sport stacking, so you know you're getting the real deal. Great for parties, gym classes, or just burning off some energy at home. Who knew stacking cups could be this much fun?