The Curve Ball X is a firm stationary foam roller that offers stable and controlled deep tissue muscle massage. The tool stays stationary so it's easier to control and target your muscles. Use your weight as leverage and let the tool do the work as you lean on a wall, sit on a chair or lay down on some other hard surface. Because it's stationary, it saves your hands and fingers from fatigue. The grey, flat non-slip base won't slide around. It stays in one place allowing for sustained traction on the muscle. The curved massage surface provides targeted muscle care and relief of minor muscle aches and soreness. Works best for back, glutes, and quads. A recommended Trigger Point Release Tool (TRP Release Tool) by Physical Therapists, Chiropractors and Athletic Trainers. Exclusive Gription offers deep grip and friction to help massage deep and bust out knots fast in fascia and muscles. So versatile, it can be used while standing, sitting or lying down. Easy to use and easy to clean. Simply use anti-bacterial gel or gently wash the surface with soap and water. At less than 4? tall and weighing less than a pound, the Curve Ball X is small and portable, making storage and snap and travel a breeze.