The yoga wheel outer ring is made from the durable and anti-slip TPE material for better buffer effect. back pain wheel textured surface also provides better friction and stability The yoga wheel for back pain inner ring is made from the highly durable ABS material, yoga ring built for super load bearing, anti-deformation and to last. the maximum able to withstand a WHOPPING 300 lbs. Free of moisture accumulation, thanks to its superior padding, you can use your new prop during the most demanding of yoga sessions. Imitation leaf vein pattern is more anti-slip, meanwhile this kind of material is easy to clean. Spine roller wheel providing you sufficient buffer for your back, shoulders, backside and limbs, allowing more comfortable stretching for your body. Considered to be the Best back opener & stretcher you could have, this yoga wheel will open you up to new sequences & forms. The yoga back roller can not only be used to train core strength, The yoga wheel can stretch the ligament and relax the shoulder massage. and to improve body posture and slouch, helping you perform all movements and poses with ease, safety, and much needed support.