These lightweight 13mm Aluminum Ball-Race Rollers function superb durability and are also constructed with 520 ball bearings available smooth rotation. Also, these rollers have less friction from program walls and may be utilized for both front side and right back roller setups. This kind of variation makes use of components that have a weight reduction of around 30per cent because of their kind and newly-bored holes. 13mm Aluminum Ball-Race Roller x2 Attachment screws included. Suitable for all Mini 4WD and Mini 4WD PRO framework products. Some chassis and figures may need modification.