For customizing your foam rolling experience, use the Roll Recovery R8 SuperDeep Massage Roller Insert. This massage roller is designed to be used with the R8 model for the most aggressive and deep massage to break up muscle adhesions and offer myofascial release. To target your tight sports, this insert feels like an elbow releasing the tension. For convenience, these R8 inserts are quick and easy to change using the included R8 tool. Enjoy the relief of a deep tissue massage with the Roll Recovery R8 SuperDeep Massage Roller Insert.