TriggerPoint GRID Foam Roller with SMRT-CORE Level 1 DVD Unique Distrodensity Zone design allows for targeted massage Designed to withstand constant, heavy, and repeated use without breaking down Step-by-step SMRT-CORE Level 1 instructional DVD to engage your core and create a starting point for increasing strength and stability 1 year warranty Only 13" long by 5" in diameter - makes it an excellent travel companion