This is special edition bundle with Basicase ™ Android Apps license key included for more fun!. SpecificationsBrand: HOBBYHOT Bearing Material: Chrome Steel Ball Material: Chrome Steel Recommend for Model: MUGEN RC MBX-RR Bearing Model, Dimensions & Quantity: MF85-2RS (Outer Diameter: 8mm / Internal Diameter: 5mm / Width: 2.5mm) x 2pcs MR105-2RS (Outer Diameter: 10mm / Internal Diameter: 5mm / Width: 4mm) x 4pcs 688-2RS (Outer Diameter: 16mm / Internal Diameter: 8mm / Width: 5mm) x 18pcs MR106-2RS (Outer Diameter: 10mm / Internal Diameter: 6mm / Width: 3mm) x 4pcs Please note that the information above is provided by the producer of the replacing bearing. All the recommended models are for reference only. Buyers should confirm the correct size and quantity of the bearings for your own model before purchased the replacing bearings. Basicase™ and HobbyHot™ are registered trademarks. Products only distributed by authorized seller.