NS Novelties Sinful Bed Restraint Straps. Add a spark of excitement to your play time. AdjustableBed Straps can be used under the mattress, around the headboard or bed posts. The possibilities are limited only by your imagination! Compatible with Sinful Wrist and Ankle Cuffs (sold separately). Made of vinyl and nickel-free hardware. Each set comes with two vinyl straps and two 12 foot super strong nylon straps. Thread one end of the nylon strap into the double buckle and the other end around the bed post, around the mattress, or if enjoying this set outdoors, around a tree or pole. Then clip your wrist cuff or ankle cuffs onto the round ring and off to play you go. Made of easy to clean vinyl and sporting all black nickel-free hardware. Being Sinful never felt so good.