Ski Visions manufactured these special length stones for folks who use tools other than the SkiSharp tool to address their edges.
A dead simple two-stone tuning system.
Use the green stone to sharpen side edges then hone and polish with the ceramic stone, finally hone and polish the base edges using the ceramic stone and you're done!
Available in 2.75" (70mm) or 4.25" (107mm) lengths.
Both length stones measure 1/4" thick and 1" wide (6.35mm x 25.4mm).
Both stones can be redressed accessing fresh grit and extending their lifespan far past that of a diamond stone.