Available in Fine (pictured) Medium or Ultrafine grits (see related items), each stone comes packaged in a rigid polymer storage case complete with non-skid rubber feet for tabletop use. As with all of Spyderco's ceramic stones, use our bench stones dry without lubricants or oils. To clean: wash with fresh water and scrub metal particles from the stones with a plastic scouring pad and abrasive powered cleanser.