GRIP DESIGN: the original Gorilla Grip grippers for hard floors help to keep your rugs in place and prevent corner and side curling; easy to apply to the underside of rugs and floors to help rugs stay in place and flat against the floor NO CURLING ON CORNERS OR SIDES: innovative design seamlessly attaches to the underside of rug corners to help prevent rugs from curling upwards away from the floor; grippers can be used under the straight sides of rugs as well EXTRA STRONG DUAL SIDED GRIP: dual s