1.Frame: Steel, painting, argon welding or CO2 welding. 2. Fork: Steel, argon welding or CO2 welding. 3. Rim: Steel or aluminum 4. Brake: F/R caliper brake or R band brake 5. Tyre: 12"*1.75, 16*1.75*, 20*1.75/1.95/2.15 6. Tube: Air or EVA 7. Free wheel: 16T /18T /20T 8. Chainwheel &crank: 12" 24T*89, 16"28T*102, 20"28T*127 9. Pedal: Plastic with reflector or without reflector 10. Saddle: Leather, spring, plastic or imitation leather 11. B. B parts: B type. 3PCS 12. Hand bar: Steel, CP 13: Mudguard: Steel, painting or CP. 14. Grip: PVC/rubber foam 15. Carriers: Steel, with or without tool box 16. Packing: 85%skd 50%skd 12" 1325PCS /14" 1040PCS/16" 930PCS/18" 800PCS/20" 660PCS (40HQ)