Price listed is for four glass stones. These are jet black square octagons that measure approximately 10mm by 7mm. They have flat tops and pointed, faceted backs. These have a recess in the middle that will fit a 31pp (6.5mm-6.68mm) point back stone. Some of these have some residue in the recess that should clean easily, or will be covered with a point back stone. The size and shape varies slightly from stone to stone.