Our 1.9 I.D. 7.5" springs are manufactured from 735A51 chrome vanadium steel. Each spring is cold coiled prior to any grinding or shaping. Then heat treated and shot peened before being finished and powder coated. The normal finish uses a FULL gloss polyester powder in jet black (RAL 9005).
If you require a size of spring that we don't have listed online then please contact us here.