The Metolius Rock Rings 3D are an innovative, portable training device that allow you to get a great upper body workout. Metolius Rock Rings 3D excel at pull-up related exercises as they allow supination and pronation of the arms and shoulders. Great for home or travelling as they can be hung up nearly anywhere. (Sold in packs of two).**Details**- New & Improved Design- Innovative, portable training device- Two independent units, each with flexible, single point suspension; allows rotation of joints for injury prevention- The master is CNC milled for perfect symmetry- Fine texture- Large jug on top; deep, incut 4-finger pocket; 4-finger flat edge, 3 finger pocket- Includes comprehensive instructions and training guide- 7.25" x 5.75"x 2.25" (184 mm x 146 mm x 57 mm)- Set of two: 4 lbs. 2 oz. (1.9 kg)- Sold in sets of two Metolius Rock Rings 3D