Master Series Interlace Bed Restraint Set from XR Brands. This Master Series Interlace Restraint Kit is versatile enough to bind them in all ways you can imagine. The kit contains eight contact points which can be sure to fit any sized mattress. The four removable ankle and wrist cuffs are made of neoprene to ensure their comfort, and yet still be restrained to your liking. Each cuff is adjustable to fit most and made with Velcro to ensure a quick release. Measurements cuffs and straps adjust to fit all. Materials Neoprene, Nylon, Metal. Note: for optimal function Queen mattress or larger, is recommended.