Strong Elastic Bed Sheet Fasteners Grippers Suspenders (Set of 4) Fits with fitted sheets and flat sheets. They are made of heavy duty elastic providing stable and strong grip. As pictured, they can hold at least 2.5 pounds, no popping off or coming apart. Built-in plastic clenching system protects fabric from harm Easy to put on and they eliminate wrinkling and bunching of bed sheets. Keeps corners in place and no more worries.