It's upgrade part Stainless steel frame more durable and handsome ,no rust.Use the original beam hole to install.No need drill hole. The logo is waterproof and colourfast.You also can diy the logo on the back of the rubber.Both of the side can be used. Stainless Steel Frame Rubber Rear Mud Flaps For UDR Unlimited Desert Racer Traxxasss 1/7 RC Upgrades