Add-ons:Brake Disk-2pcsStainless metal Pin 2x11-2pcshandbook number:1654Product major function & usage:1. Combine tires and front & back wheel shaft for smooth turning2. Good decoration partMajor advantages of updating for this item:1. Contemporary metallic design with swirl engraving regarding exterior band.2. Compare with original 6mm, this component is made 8mm to widen the wheel track for better stability of this chassis.3. Unique design of hex claw to put on the wheel hub tightly, more stable and makes the wheel more powerful.Other unique records and remarks:This item can't be combined with GPM Racing #SSLA1277RH, SSLA1280FH, SSLA1277RHA, SSLA1280FHA, SSLA1280FH21, SSLA1277RH22