1. Foam rollers developed by physical therapists 2. Foam roller that helps maintain proper posture by deep stimulation of spine and fascia through rolling movement 3. It is the patent product that applied mechanical joint structure stretching spine to foam roller. PU95 Specification: Material : Premium integral skin foam Areas : Neck, Back, Waist, Hip, Thigh, Calves, Feet to Deep Muscles Size : 9.5cm x 30cm Weight : 490g Recommended to : Beginners, People with weak muscles Product Use: The best value that Core Diet Deep Roller pursues is sustainable life for your spine care effective Solution to Spinal Health Deep Roller. While typical foam rollers only affect the stimulation of muscles and fascia, core diet deep rollers also analyze the spine�?�¢??s mechanical structure. It is designed to return the joints of the spine (cervical spine, thoracic spine, rib, lumbar spine, long bone, etc.) back to their normal position while carrying acupressure exercise.