1. Material: SUS301 2. Heat Treatment to the surface 3. Skillfully warp by SUS301 imported from Ja 1. Material: SUS3012. Heat Treatment to the surface3. Skillfully warp by SUS301 imported from Japan, vacuum heat treatment, surface brightness, good elasticity, durable.4. Accept custom-made according to drawing and samples.5. Spring for door or window up and down6. Customer specification and design are welcomed7. Deliver promptly.

Constant Force Spring