GoFit Deep Tissue Massage Ball 5"/12.7 cm GoFit's Massage Ball reaches deep muscle tissue—targeting knots and trigger points to relieve pain and soreness. Made of dense lightweight foam with a solid core, this unique tool targets virtually all muscle groups. It has a soft textured surface to keep it in place while you roll away muscle pain. Leaning on a wall or laying down, simply press and roll. You decide how much pressure to apply for maximum Relax. Product Measurement Approx mm (L x W x H): 5"/12.7 cm Diameter Colour: Green Includes: One 5" Massage Ball Training Manual