The detailed specification as follows:
 
1. Size: From 12"-20";
 
2. frame: steel and painting, thicker argon-arc welding or Co2welding;
 
3. Fork: Steel and painting, Co2 welding steel/ suepensionfork;
 
4. Rim: 12"-20" inch steel, alloy aluminum or with rim card;
 
5. Handlebar and stem:ED argon-arc weldingφ 22×0.8-1.2mm;
 
6. Tyre: Air tyre or EVA tyre;
 
7. Chainwheel&Crank: 12": 24T&TImes; 12: 24T&TImes/89;16": 28T&Times/102; 20": 28T&Times/127; CP/ED
 
8. Crank: CP. UCP or ED;
 
9. Brake: Caliper, Coaster, Band or Disk Brake;
 
10. Flywheel: 16T/18T/20T; Brown, Black or CP;
 
11. Mudguard: Plastics or Steel;
 
12. Chain: 9 type or full chain cover;
 
13. Pedal: Plastics with reflector, without ball, PP/TPE/Alloy;
 
14. Saddle: Good leather, common or spring/ plastic/ imitationleather/ plate PVC Top;
 
15. Grips:PVC/ TPR/ Rubber Foam;
 
16. B.B parts: One piece, ED;