Make sure that your rollers are running at top efficiency by fitting them with these ball bearings. Made from steel, they will provide smooth progress along the track, in conjunction to superior reliability.
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.
