TriggerPoint GRID Foam Roller  with SMRT-CORE DVDs Unique Distrodensity Zone design allows for targeted massage Designed to withstand constant, heavy, and repeated use without breaking down Three SMRT-CORE DVDs - Levels 1, 2 and 3 - provide foundation and step-by-step exercise instructions for increasing strength and stability 1 year warranty. Ultimate Grid Package Only 13" long by 5" in diameter - makes it an excellent travel companion