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These are SPRiT Multi-Stage springs, which combine a medium linear + slow linear force curve rate. These are made in M0, M1 and M2 styles, currently we only have M2 in-stock.
The M2 starts 2g-3g heavier than the M1 (and the M1 starts 2-3g heavier than the M0 version), similar to Slow Extreme III vs. Slow Extreme II & I.
Made from high-quality stainless steel with 99.5% precision.
Each pack comes with 100 springs and it does not matter which way the spring is oriented.
To see our full shipping policy, including international shipping, please see our Shipping Policy page.