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 M1 and M2 styles in weights of 55g, 63.5g, 68g & 72g.
The M2 has same force curve, but starts 2g-3g heavier than the M1 version, similar to Slow Extreme II vs. Slow Extreme I. Each pack comes with 100 springs and it does not matter which way the spring is oriented.