We are the sole agent wholesaler as "Leader" spring in China/ Hongkong.  Yellow, Blue, Red, Green, Brown...Many kind of color represent different loading.

Yellow - SF - Lightest Load Spring JIS B 5012 Japanese Standard

Blue   - SL - Light Load Spring JIS B 5012 Japanese Standard

Red    - SM - Medium Load Spring JIS B 5012 Japanese Standard

Green  - SH - Heavy Load Spring JIS B 5012 Japanese Standard

Brown  - SB - Super Heavy Load Spring JIS B 5012 Japanese Standard

Specification:

High grade alloy spring steel with characteristics to be found in automotive engine valve springs manufactured to JIS(Japanese Industrila Standards)

All springs are compressed to solid to eliminate initial free length reduction.

Shot peened to reduce stress levels and improve working life.

Epoxy resin coating as standard - Delta Tone 9000 coating available on request.