NSK (Nippon Seiko K.K.) Made-in-Japan High-Performance 520zz Ball Bearings 1 Lot (100 pieces) Specs MC2 Outer Diameter: 5.0mm Inner Diameter: 2.0mm Thickness: 2.5mm This is a high-performance product with the least play and rolling resistance among the currently available 520 bearings. Since they have not been degreased, please perform basic maintenance such as cleaning with a cleaner and lubrication before use. The bearings are stored in a dehumidified storage according to the manufacturer's storage standards (see images 2 and 3). Search terms: Charger Discharger Carbon Pera tires (special tires for Mini 4WD) Processing Flex (likely referring to a type of Mini 4WD chassis modification) Anodizing Jig Fence car (likely referring to a type of Mini 4WD) Super Four Wheel Drive (Mini 4WD) Mini 4WD