Hand Picked 23 cm/9-in Ironwood Cottage Mill® with CrushGrind®Ironwood. It's called that because it's super hard. And it's relatively rare. I only have this because a buddy who runs a landscape company came across an Ironwood branch. This is a very rustic 23 cm 9 in Cottage Mill in rare Ironwood, with a cut off and healed branch nub. All my mills have an adjustable ceramic CrushGrind mechanism, with a 25 year guarantee.