HYPERICE Hypersphere - Green Features 3 vibrating speed settings to release sore muscles Can be used to activate, soothe, or loosen muscles/fascia in the feet, calves, hamstrings, glutes, hip flexors, shoulders, back, and forearms. The Hypersphere’s high-intensity vibration allows you to release tension and target areas deeper than a traditional foam roller. The textured rubber exterior targets vibration for more localized therapy. Compact size of 5-inch (12.7 cm) diameter. Lightweight at only 2.25lb. Cordless, compact design – perfect for travel and on-the-go (TSA approved). Purchased to test product for clients. Used only a few times. Had 2. Sold 1.