This is special edition bundle with Basicase ™ Android Apps license key included for more fun!. Specifications Brand: HOBBYHOT Bearing Material: Chrome Steel Ball Material: Chrome Steel Recommend for Model: Kyosho RC MAD ARMOUR / MAD FORCE RTR Bearing Model, Dimensions & Quantity: 6700-2RS (Outer Diameter: 15mm / Internal Diameter: 10mm / Width: 4mm) x 1pcs 688-2RS (Outer Diameter: 16mm / Internal Diameter: 8mm / Width: 5mm) x 18pcs MR126-2RS (Outer Diameter: 12mm / Internal Diameter: 6mm / Width: 4mm) x 2pcs 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.