SPRiT's newly launched multi-stage springs are here and in-stock! These combine a medium linear + slow linear force curve rate. These are available in M0, M1 and M2 styles in a variety of spring weights.
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.
Each pack comes with 100 springs and it does not matter which way the spring is oriented.