For those who desire the most aggressive, deep feel for myofascial release and breaking up muscle adhesions, the SuperDeep Insert is the answer. Target specific areas with the elbow like design to apply the deep force needed. For maximum intensity, use two SuperDeep Inserts on both sides of the R8. Or for a unique feel, try one SuperDeep Insert along with the Standard or SuperPlush Insert on the other side. Available in Boulder Black color.