This single-use foldable double-restraint cuff allows for better control and is more humane and hygienically safer than standard metal cuffs. The UZI-FLXC-B Single Use Double-Restraint Flex Cuff features better control and is more humane and hygienically safer than standard metal cuffs. Comes in black. UZI combines advanced technical concepts with innovative designs to produce products used and trusted by the Army, Secret Service and Special Forces. Since its launch in the 1950s, UZI has become one of the world’s most famous firearm brands and a 20th century icon.