Sport Stacking with Speed Stacks(R)! Using 12 sturdy plastic cups (called Speed Stacks) up stack and down stack in predetermined sequences as fast as you can. StackMat(R) competition timer, instructional DVD and sport carrying bag for the cups are all included in this package. Play independently, on a team, or challenge a peer. Speed Stacks, Inc. has a website designated just for educators/therapists/professionals.