- SIZE: 12x24cm - The Grooves - Spine, bones, & tendons drop into the grooves to prevent compression, damage, or bruising. The grooves are engineered to the specifications of a thumb to mimic the effects of a deep tissue massage on the muscles. - The Bumps - Target muscles with pinpoint precision for more effective muscle release. The bumps are designed to mimic the shape of palms and elbows to enable muscle release similar to a deep tissue massage. - The Ends - Rounded ends enable the use against a wall for more control and less pressure. - The Spinal Channel - Specifically engineered to cradle and protect the spine. Effectively release tension and pain in the back and neck without putting pressure on the spine, shoulder blades, or kidneys. - Foam Quality - High quality EPP foam that doesn’t break down and holds its shape over time. - Benefits - Superior to flat foam rollers on improving flexibility, muscle recovery, sciatica, and releasing back and neck tension and pain.