Top quality, heavy duty, steel and Steloy construction Steloy material makes the handcuff 40% lighter and 17% larger than standard cuffs Solid links connect the cuffs as opposed to the roller chain Heavy-duty, solid hinges for reinforced holding power Hinged models provide greater subject control 18 tooth, 3-retaining-bar system for uncompromising security Positive swing-through action Crafted from a combination of steel and aluminum known as Steloy, this lightweight hinge style cuff features solid hinges for reinforced holding power. This lightweight hinged model cuff is 40% lighter and 17% larger than a standard hinge handcuff.