Sprinco's extractor springs are crafted from premium chrome silicon wire, meticulously heat treated, stress relieved and cryogenically processed after winding. Each spring is then plated with a re-micronized molybdenum disulfide coating for superior durability and friction reduction. Sprinco's XP 5-coil extractor springs possess a greater load capacity compared to OEM springs, thereby negating the necessity for D-Fender rings or CRANE O-rings The springs are constructed from heat-treated, stress relieved chrome silicon wire stock and are capable of withstanding temperatures up to 750 deg F These springs are engineered for durability and performance, potentially serving as the sole extractor springs required for the entire lifespan of your bolt