D-Ring aids are a great addition for in the gym Attaches directly to cable and pulley systems Gives greater range of movement Good for those with limb differences that affect hands Machine washable D-Ring aids are ideal for use in the gym. They allow attachment directly to the karibiner on gym equipment such as cable and pulley machines. This gives the benefit of a greater range of movement as well as pulling directly from the wrist. D-Ring aids are beneficial for both those with weak hand function and those with limb differences. They allow direct attachment to the karabiner on gym equipment such as cable and pulley machines, giving you a greater range of movement. The price is for a pair of D-Ring aids - left and right hands.