ASP Tactical Hinged Handcuffs - Pink Tested for durability Hinge type. Strength potential has been maximized through use of an interlocking, unitized frame. The cuff structure is forged from high strength stainless steel. Made using the highest quality materials Flat Contact Surface with fully Radiused Edges, Serial Numbered Recessed Keyway on Each Side of Cuff with Yellow Indicator Double Lock Alert Replaceable Lock Sets Four Point Hinge