If you are unsure what compound to purchase

F150 + F400 OCB

— Shortened

Regular - vintage soft stone for coarse sharpening

venev unicorn series dual side resin cbn 6 x 1 Grit:400 + 800 If you are unsure whatVenev Unicorn Series Dual Sided Resin Bonded CBN Stones are designed for use in sharpening systems such as Hapstone and TSProf, as well as for freehand sharpening. CBN (Cubic Boron Nitride) is the second hardest material after diamond, offering exceptional wear resistance and thermal stability. CBN sharpening stones provide excellent performance when working with high alloy, powder, and hardened steels. The Unicorn Series represents Venevs premium