NMB (MinebeaMitsumi Inc.) High-Performance 620zz Ball Bearings Set of 10 Outer Diameter: 6.0mm Inner Diameter: 2.0mm Thickness: 2.5mm These are high-performance bearings with the lowest rolling resistance among the currently available 620 series. The outer ring has a thick structure like the old 620, making it resistant to chassis twisting and resulting in less loss. Since they have not been degreased, please perform basic maintenance such as cleaning with a cleaner and lubrication before use. In-stock items are stored in a humidity-controlled storage unit according to the manufacturer's storage standards (see images 2 and 3). Discounts are available for multiple purchases of other or the same products. Please inquire in the comment section. Search terms: Charger Discharger Carbon Pera tires Processing Flex Anodized Jig Mini 4WD