From the manufacturer:

Pencil is retractable and never needs sharpening - just twist up! 

• Unique pencil-to-powder formula.
• Weatherproof - stays put!

Finally a solution for the fair-haired - this pencil is awesome - the blonde is really blond!  The auburn is really auburn!  You will love that it matches your exact hair color so brows don't appear painted on.  For an even softer look try theVanitymark Brow Powder.