Tumbl Trak Booster Block HIGH QUALITY - Tumbl Trak Booster Blocks are constructed a rigid long lasting polyurethane foam that is covered by an industry leading 18oz knife coated vinyl. SMART DESIGN - The Tumbl Trak Booster Blocks have special Velcro placement along the edges to connect side-by-side, end-to-end or on top of one another! GREAT FOR MULTIPLE ACTIVITIES - Due to the simple yet innovative design; The Tumbl Trak Booster Blocks can be used for many activities in the gym including tumbling, vault, beam, spotting, conditioning, and more! APPEALING COLORS - Tumbl Trak wants to make sure you have options, that's why we offer the booster blocks in a variety of appealing colors! WE KNOW TRAINING EQUIPMENT - When you purchase a Booster Block from Tumbl Trak, you know that youre getting a TRUE training product. Coaches, former athletes, and industry experts make up the Tumbl Trak Staff.