Sprinco's Ejector Springs are made of chrome silicon wirestock that has been heat treated, stress relieved, and cryogenic processing post winding. The springs are also plated with re-micronized molybdenum disulfide formulation. ADVANTAGES: Enhanced ejector springs match the loads of a NEW Mil-Spec spring. Unaffected by heat up to 750AdegF Extreme length duty cycle while maintaining performance specifications. Mfg: Sprinco Usa