The R8(TM) features an integrated spring configuration, stainless steel hardware fasteners, ball bearings in all pivot points, soft-touch handles and the ability to change the roller Inserts for a customizable feel. Features: Applies deep-tissue massage force for targeted muscle relief Versatile use while sitting, standing, or lying down Improves circulation and helps reduce inflammation Breaks up muscle adhesions for effective myofascial release Interchangeable R8-Inserts allow customizable pressure and feel Soft-touch handle for comfortable grip and control FDA Registered Medical Device #D229174