Mud Guards work with RPM #80812 A-arms exclusively (for the ARRMA Kraton 8S). They prevent sandblasting of your shocks and shock shafts, prolonging the life of your shocks and shock shafts while reducing maintenance of the shock shaft seals. Additionally, by keeping debris kicked up by your front wheels off of your rear driveline and suspension components, these key mechanisms will last longer and run much smoother between cleanings.Mud Guards are extremely light (weighing in at only 18.5g. each) sold in pairs and molded in an engineering blend of incredibly strong nylons for a lifetime of protection you can trust.Tech Notes: RPM Mud Guards work exclusively with RPM A-arms (RPM #80812). They are not designed to work with stock or any other aftermarket A-arms.