One of the weakest points on a Lexan body is where the body mounts to the chassis. The holes put in the body for the body posts have a tendency to crack & fracture. This is the reason RPM designed these cool body savers. With their ideal two piece design, it allows one piece to slide through the bottom of the body while the second piece snaps into place from the top of the body. These body savers stay right where you put them, on the body, so you never have to worry about chasing them around! We have found that body life tends to triple when they are installed! Molded from black nylon and sold in a set of five, four for the body mounts & one for the antenna hole!.