The Model 8210-3 SpareCuff is a single cuff for controlling both wrists and ankles. It has a tensile strength of more than 400 lbs. and provides ample space on its 1/2 in. (1.27 cm) width to write down subject information. Available in both black and white and when laid flat, measures 22 in. (55.88 cm) long. Pack of 3. Constructed of nylon for dimensional stability and flexibility, the Flex-Cuf was designed to be a quick, temporary alternative to handcuffs. The unique Strength Barb System contained within the Flex-Cuf head makes it virtually pick-proof.