Roll away tense muscles and work out all the kinks with RP Spiky Massage Balls. Featuring firm outer ridges, this set of massage balls delivers deep tissue self-massage to ease pain, improve mobility and help with injuries of the foot, calves, hamstrings and more! RP Spiky Massage Balls are sized for versatility, small and light enough to carry in your dance bag. Packaged in a mesh bag great for storing between uses.