Add-ons:Brake Disk-2pcsStainless metal Pin 2x11-2pcshandbook quantity:1654Product major function & use:1. Combine tires and front & straight back wheel shaft for smooth turning2. Good design partMajor benefits of upgrading with this specific product:1. Modern metallic design with swirl engraving regarding outside musical business.2. Equal initial 6mm, this component is made 8mm to widen the wheel track for better safety using this chassis.3. Unique design of hex claw to hold the wheel hub tightly, more stable and makes the wheel more powerful.Other unique papers and remarks:This product cannot be together with GPM Racing #SSLA1277RH, SSLA1280FH, SSLA1277RHA, SSLA1280FHA, SSLA1280FH21, SSLA1277RH22