Rumbleroller Original Textured Foam Roller - Deep Tissue, Self Myofacial Release Massage Therapy Roller (Rumbleroller 22" Midsize Original Foam Roller)INgENIOUS DESIgN The surface of the RumbleRoller contains specially designed bumps that are firm, but flexible, much like the thumbs of a massage therapist As you roll over the top of the RumbleRolle..