1. Ecnomic tooling cost
2. One-piece construction
3. Weight reduction-compared to most of other metal
4. Uniform wall thickness-nothing in the extremites
5. Thickness can be varied as required
6. Varieties of finished and color
7. Be able to produce multi-wall moldings
8. Design flexibility-from small & intricate to large & complex
9. metal inserts as integral parts
10. Short lead time
11. Resistance to stress-cracking and corrosion.