You use this pencil like you normally would, but when you would normally go sharpen the pencil, instead you just slide more lead out, just like a razor knife! In fact, the replacement carbon fiber lead packs fit most 9mm utility knifes on the market. This carbon fiber lead is 20 times stronger that normal lead and can last up to 4-6 months of continuous use! You get consistently sharp lines time after time. Plus the pencil has a real wood grip and spring steel pocket clip for easy storage.