About This Versatile Back Roller: This wheel provides a versatile solution for stretching and relieving back pain through its padded foam construction and center spine cradle. Yoga Wheel Design: Designed with a wheel shape, this product can be used for various stretches, yoga poses and exercises to improve flexibility and posture. Comfortable Padding: The foam padding offers a comfortable surface for your back during stretching and rolling exercises. Portable Size: The largest wheel having a diameter of approximately 13.78 inches, the medium wheel having a diameter of 10.63 inches, the small wheel having a diameter of 6.7 inches and the extra small wheel having a diameter of 4.72 inches the wheels nest one inside each other for compact storage and provide four different levels of stretch. Each wheel has a width of 4.92 inches. This wheel is compact and easy to carry for use at home, the gym, or while traveling. Durable Construction: Made from high-quality materials, this back roller wheel is built to withstand regular use and provide long-lasting performance. Overview Use for : Arm, Back, Body, Legs, Shoulder Power Source : Manual/Hand-Powered Material : Acrylonitrile Butadiene Styrene Item Weight : 5.7 Pounds Brand : YOGI GRIPS