Diameter: 6.3 cm, Weight: 145g Easy self-massage at home. Just roll it over tired areas. Stimulates trigger points and releases fascia. You can easily self-massage your neck, shoulders, back, lower back, and calves. Simply lie on your back and place the ball on the painful area, applying your weight and rolling it around to refresh yourself. You can easily stretch and perform a full-body self-massage at home. It's designed to resist deformation even with weight applied, ensuring stable movement even after repeated use. It's a safe silicone ball, so you can simply use it in the bath. Lightweight and small design, easy to carry. For those who lack exercise, office workers, and those with stiff bodies from prolonged postures, you can self-massage anytime, anywhere, immediately.