These lightweight 13mm Aluminum Ball-Race Rollers function superb durability and tend to be additionally constructed with 520 ball bearings available smooth rotation. Also, these rollers have actually less friction from program walls and may also be properly used for both front part and straight back roller setups. This variation employs components that have a weight reduction of around 30per cent because of their type and newly-bored holes. 13mm Aluminum Ball-Race Roller x2 Attachment screws included. Ideal for all Mini 4WD and Mini 4WD PRO framework services and products. Some chassis and numbers may need modification.