Perhaps the most neglected complex structure in the body, feet are often ignored and require great care. We set out to rethink what a foot roller should be and how we can make the best roller in the world. Non-symmetrical in form, the R3 features a medial convex surface to stretch the plantar and all the small intrinsic foot muscles. Two concave sections allow for medial and lateral rolling of the foot and placement of the heel to target the surrounding soft tissue. Provides stability even applying full body weight, where other ball-like rollers can't. Non-slip and works over any surface includes hardwood floors. Compact, lightweight makes the R3 easy to travel Works great as small compact body roller. Specs FDA Registered Medical Device Dimensions: 5.5” x 2.5” x 2.5” (14cm x 6.4cm x 6.4cm) + Box Dimensions: 8” x 5” x 4” (20.3cm x 12.7cm x 10.2cm) Weight: 0.875 lbs (.40kg) + Box Weight: 1lbs (.45kg) Body: TPU soft-touch material Core: Engineered ABS core