This set is a plastic version of the aluminum spacers from Item 15473 JR Aluminum Spacer Set - 12 / 6.7 / 6 / 3 / 1.5mm. Each is around 40% lighter than its aluminum counterpart. Their low friction plastic minimizes time loss from contact with course walls. 20 total spacers of 5 different thicknesses are included, allowing you to make pinpoint set-up changes to your Mini 4WD machine. - 2.1 x 4 x 1.5mm Spacer x4 - 2.1 x 4 x 3mm Spacer x4 - 2.1 x 4 x 6mm Spacer x4 - 2.1 x 4 x 6.7mm Spacer x4 - 2.1 x 4 x 12mm Spacer x4 - Special Purple Color.
