As racers know, a polished steel edge is a fast edge.
These ceramic stones are used after diamond or aluminum oxide stones to final polish and hone base and side edge surfaces.
This helps reduce edge drag as well as unwanted rusting.
They measure 5" x 1".
Some world cup techs feel these stones cut better and last longer if used wet (dip 'em in a cup of water), and brushed clean with an old toothbrush about every 10 tune-ups with a vinegar and water solution (mixed in equal parts), or with a cleanser like Comet or Ajax.
All stones include a leather sheath.
THREE OPTIONS AVAILABLE
fine 600-grit stone,
ultrafine 1200-grit stone
Double Stuff stone with both grits...one on each side.