SueSport Yoga Wheel Body Wheel for Stretching, Fitness, and Relaxation. Best Back Opener on the Market. Relieves Pain and Stress in your Back, Hips, Chest, and Shoulders. Size 13" x 5" Best back opener -- It helps to open the?entire?back,?makes?back?bending?accessible,?develop?back?strength. Excellent for opening up your back, hips, chest, and shoulder. Comfortable & Durable -- Extra comfort mat (TPE) constructed over a rigid hollow core (ABS), it is designed to withstand constant, heavy, and repeated use & retain shape, making the product much firmer than a typical foam roller (which tends to soften and lose shape with use). Lightweight & Portable -- SueSport Yoga Wheel is 13" diameter by 5" height, which easily fits in your gym bag or carry-on luggage. Pose Index - Not sure how to use it?! SueSport 's Pose Index offers over 20 ways for beginners, intermediate and advanced yogis! 60-Day Money Back & 1 Year Warranty -- If you are not happy within 60 days we will refund or replace the product. We have a 1 year manufacture's guarantee on all of our products.