Foam Roller 2 in 1 Trigger Point Roller with Free Carry Case for Muscle Relaxation, Deep Tissue Massage,Injury Rehab 2 in 1 foam roller design is upgrade from hollow foam rollers, the outer layer is just as a hollow foam roller, while the inner is solid. You can get two rollers experience and difference exercise. A lot of benefits your will get by exercising with this foam roller: Release myofascial trigger points and loosen knots in muscles, relax your back, buttocks, arms, legs; Massage your body. Perfect as a hip adductor roller, pain alleviator. Different density zones has different pressure, the trigger points has strong stimulations, the finger points has medium stimulation, and the palm points has mild stimulations. Environmental high density EVA material, rich in cushioning elasticity, which is strong and durable, one foam roller can last many years. So no worry about it will lose its shape. he package comes with a portable carry bag, perfect for contain the foam roller, the foam roller is lightweight, so very easy to carry it around. Ron