It is made of silicone plastic and its ingredients have passed the RoHS test. The curved edges eliminate the worries of skin scratches.The belt buckle holder only applicable to vehicles of which the seatbelt buckle is floppy and meant to be hidden so this holds it up nicely. It doesnt work with vehicles of which the buckles were fairly stiff already.Kids may have difficulty getting the buckle to stay up while pulling the seat belt over, especially when a booster seat is applied. You may be in a hurry, unable to spare a hand for buckling the seatbelt, or have difficulty locating the seatbelt buckle at night. In these cases, belt buckle holder becomes indispensable.Ergonomic design. After applying the belt buckle holder, the belt buckle (belt receiver) will tilt forward at an angle so that passenger can plug the seat belt in with a more comfortable way. Its circle base allows holder to stand firmly on the rear seat.How it works? The seat belt buckle holder keeps the belt buckle of the rear seat in a favorite position where passengers can easily plug the seatbelt in with just one hand, and the buckle doesnt disappear into the seat or flop around causing frustration.Attention! This product does not fit all car models. Please check your vehicle for compatibility before purchasing! Internal dimensions: 1.97*1.2 inches. The seat belt buckle holder is only compatible with buckles connected by straps. It does not work with built-in buckles or buckles connected by steel plates.