This kit will pull their knees back and leave them exposed and helpless to you. 4 cuffs bind their wrists to their ankles, while the tethers hold them in place. Each piece connects easily with snap hooks. The tethers can be attached to rings or posts, or looped around and attached to themselves to affix to a bed frame or post. The cuffs are durable nylon with a Velcro closure, and offer a wide range of adjustability with a quick release. Measurements: Cuffs: Each cuff is approximately 16 inches in total length and 2 inches wide; Tethers: 31 inches in length and 1 inch in width. Material: Nylon, metal. Color: Black. Note: Kit contains 4 cuffs and 4 tethers