★These are lightweight versions of the popular 19mm aluminum rollers, with 6 holes in the body for a weight savings of roughly 30%! ★Rollers are given a gun metal color finish, and have a 520 ball bearing installed for super smooth rotation. ★This product includes 2 rollers, plus spacers and screws for attachment. Compatible Cars Mini 4WD and Mini 4WD PRO cars *Some bodies may require modification.