1. piano wire
1) lower SWP-A tensile strength
2) high tensile strength SWP-B

2. hard steel wire (black wire)
1) SWC60 SWRH62A low carbon
2) SWC80 SWUH83A higher carbon content, and wide application.

3. stainless steel wire (Stainless steel wire)
1) SUS302 points: WPA, WPB
2) SUS304 points: WPA, WPB
3) SUS304 authenticity: WPA-AS, WPB-RS

4. galvanized steel wire
1) galvanized steel wire
2) nickel-plated steel wire
3) copper wire
4) gold-plated steel wire