Give those knotty muscles a rest with the TriggerPoint CORE Foam Roller - 18. Made form solid EVA foam. This foam roller uses one' s own body weight to apply direct pressure to knots for muscle relief and increased blood flow. The revolutionary tool is based on a grid system of varying widths and densities. Intensity levels are in your control by repositioning the Grid. The Matrix of 3-D Distrodensity Zones allows for blood and oxygen to channel through and create elasticity in the muscle to deliver a precision massage associated with Self-Myofascial Release Therapy. Sturdy EVA foam will not break down with normal day-to-day use. Length: 18 in. Diameter: 5.5 in. Imported.