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Did a search and they appear to be pencils used on slates as Olivia says. (BTW what is the latest on the Olivia hone? I can't remember the other name you are using. I'm tellin' ya, your missing out...

I can barely see it in person. I can't even feel it with my "edge testing thumb". It doesn't seem to be much of anything.

Maybe I could use a No 2 pencil?

http://straightrazorpalace.com/attachments/basic-honing/25522d1243571450-x-hones-pink-barber-hone.jpghttp://straightrazorpalace.com/attachments/basic-honing/25523d1243571450-x-hones-pink-barber-hone1....