★These black-anodized aluminum spacers are necessary parts to adjust roller height settings of your Mini 4WD machines. ★Set includes 12mm, 3mm, and 1.5mm aluminum spacers (4pcs. Each). In addition, fluorescent green stabilizer head (4pcs.) and 2x30mm stainless steel screws (4pcs.) are also included. ★Compatible with Mini 4WD PRO and Mini 4WD cars.