The Original Worm is the portable, full-body massage roller that combines the benefits of therapy balls with a foam roller. The Worm's 2 compact sizes make it perfect to use at home, in the car, on a plane, at work, at the gym...anywhere. The Worm provides neck to foot relief and pretty much everything in between. The Worm is made of durable, lacrosse style, solid rubber balls encased in neoprene. Available in two sizes, the 6.3 and the 7.0. Available in pink or black. Mesh bag included. The 6.3 is (4) 6.3 cm balls and is smaller and firmer than the 7.0 providing a more intense, deep tissue type massage. The 7.0 is (4) 7 cm balls, giving a great all around massage covering more surface area.