American-made RV hard bumper plugs. These plugs are made using a dense high-impact rubber material that will not fade or shrink - perfect for a life on the road. Tough enough to stand up to harsh weather and road conditions, variable temperatures, and constant exposure to sunlight. 3.75” square design and tabs ensure a snug and secure fit. Center hole offers air ventilation and makes removal of plugs easy. Should not be cleaned with ammonia or harsh cleaning agents. Fits 3 ¾” bumpers.