King Size - Four straps secure sheet sides under the bed, and drawstring cinches sheet tightly around mattress. Anchors attach to the sheets but can be removed. The cuffs are tightened with industrial strength velcro and attached to the anchors on the sheet by safety clips. Set includes: Fitted bedsheet cover, four anchor pads, and four cuffs. You can velcro two cuffs together to make a thigh or collar cuff.