ISMI Springs are Better Because   Certified Aerospace Specification Materials insure consistent mechanical properties of the bulk material. This means repeatability of performance in every production run.  ISO 9002 Quality Control Standards are used to give the shooter springs that are dimensionally consistent.  All Springs are Heat Treated, Shot Peened & Stress Relieved to enhance durability, consistency and reliability.  Proprietary Design Features enhance the springs ability to hold the pistol in battery longer when fired to maximize energy dispersion and reduce sight movement.  Maximum Service Temperature of our materials goes up to 700 Farenheit. Music wire has a maximum service temperature of 250 Farenheit and can be negatively affected at temperatures as low as 175 Farenheit. This is important because temperatures approaching or exceeding the maximum service temperature are highly detrimental to spring life. Exposure to maximum service temperatures promotes additional spring set and is detrimental to the relaxation of the spring. In other words, the spring will not decompress as rapidly.