The newest product in GoFit's Adaptive Massage Revolution. This portable tool is great for travel and reflexology massage on the go. FEATURES: 10 interchangeable Rings for Adaptive Massage Rings are in 5 sizes to be rearranged for multiple massage options Rings are of molded foam with rounded studs, perfect for reflexology massage Length: 7.25" - Wheel Dia: 3.125" Ring outside diameters - Profile 1: 2.875" (74mm) Profile 2: 2.625" (66mm) Profile 3: 2.25" (58mm) Profile 4: 2" (50mm) Profile 5: 1.625" (42mm)