Tamiya 95400 Lightweight Plastic Spacer Set (12/6.7/6/3/1.5mm) (Red)This is a Mini 4WD plastic spacer set. It is lighter in weight compared to the aluminum spacers such as Item 15473 JR Aluminum Spacer Set. Each spacer 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 machine.