An 10" Spring would suit a 15.5"- 18" Open Length Protech Damper.
Our 2.25 I.D Springs are manufactured from 735A51 Chrome Vanadium Spring Steel. Each spring is cold coiled prior to any grinding or shaping and then heat treated and shot peened before being finished and painted.
All our springs are powder coated. The normal finish uses a FULL gloss polyester powder in Black (RAL 9005).
If you require a size of spring that we don't have listed online then please contact us here.