RumbleRoller, Extra Firm, Black 31 x 6 ::

Physical therapists, trainers, and athletes use foam rollers to relieve muscular pain and tightness ("adhesions", "knots", or "trigger points"). But conventional foam rollers have smooth, hard surfaces that further compress soft tissue. They improve blood flow and flexibility, but the effect is limited unless you spend a lot of time rolling.

The RumbleRoller was created to perform a more effective therapy.

The RumbleRoller Manipulates Soft Tissue - Like a Massage Therapist! The RumbleRoller contains specially designed bumps that are firm, but flexible, much like the thumbs of a massage therapist.

As you roll over the RumbleRoller, the bumps knead the contours of your body, gently stretching soft tissue (muscle and fascia) in multiple directions. This erodes trigger points, restores flexibility, and relieves muscular pain.

The extra-firm version (black) is intended for experienced users with dense muscle tissue that doesn't respond to normal massage pressure.  This item is is 31 x 6 and is available in black.