These stabilizers can be attached to front rollers, and help balance the car if it loses shape during a corner. ★They will also provide a dash of color to your model. ★Diameter: 8mm, height: 10mm. ★Set includes three stabilizers, plus screws, etc. for attachment. Compatible Cars Mini 4WD & Mini 4WD PRO cars ★Left: Example of attachment (Mini 4WD kit is sold separately.) ★Right: The stabilizer head prevents body lean, and facilitates stable cornering.