Kreft Moto revalve control They are air so the "spring rate" is set by air psi.  Valving is 200# vet MX (soft setting that works good for breaking bumps and trail ridding).  Allows you to adjust externally what you would typically have to do internally. Lots of good videos and articles on how good these are. Listing is for forks only, I do have a 16-22 shock with Xtrig preload adjuster as well.