TriggerPoint CORE Multi-Density Solid Foam Roller with Free Online Instructional Videos Solid-core EVA foam roller is more durable than standard polypropylene rollers that can break down and become soft Unique multi-density GRID pattern provides targeted compression ideal for self-massage, relieving pain and improving flexibility Versatile 18-inch length is perfect for most muscle groups; 36-inch length supports the entire spine during yoga, Pilates, and recovery exercises Includes access to free online instructional video library on foam rolling exercises from the experts at TriggerPoint 36-inch TriggerPoint CORE foam roller; moderate compression; approximately 36 x 5.5 inches; 325 pound weight limit; 1 year manufacturer's warranty