In particular

Black - ultra-fine grit range for finish sharpening and honing

All adapters are sold in singles

Atago stones may have slight natural imperfections

please refer to the table below

gunny glide graphene lubricant Scent:Clover In particularGunny Glide is a revolutionary graphene h BN based lubricant designed to work on all surfaces. Graphene and hexagonal boron nitride are two dimensional one atom thick materials. Graphene, a single layer of carbon atoms, is 200x stronger than steel and has more lubricity than any single material known. Graphene when suspended in a lubricant and applied to a surface will burnish itself to that surface. It not only fills any pores or defects in a surface