Accessories:C-Hubs-2pcsStainless Steel Round Head Screw 3x16-2pcsManual number:LOS234012Product major function & usage:Stabilize knuckle arms and upper tie rodsMajor advantages of upgrading to this product:1. Aluminum 6061 T6 is light material with high tensile strength for great durability during extreme RC action.2. Delrin collars are inserted to minimize the gap and friction so that the steering performance is top rated and in harmony with the rest of the vehicle.We use a quality light weight high tensile strength aluminum 6061 T6 and is then anodized with scratch resistant colorsWe also have a big selection of multiple colors available now!! Let¡¯s ¡°hop up¡± your vehicles to give them the best looks and performance on the market ¡¦ colors are available in blue, red, grey silver/gun metal, orange, green, black, brown