Sketch artists love this pencil sharpener because it is so small, sturdy, and great making sharp points. Blades are replaceable, but they can also be removed and re-sharpened with a knife sharpener. That's cool. Solid brass construction with steel blade means this sharpener is extremely durable. This is the "creme de la creme" of single hole pencil sharpeners. Every artist, drafts-person, engineers, and designer deserves to have the proper high-quality tool to make sure nothing stands in the way of the creative process. Comes in a box of 12 because you will want to have one right at hand everywhere you go and a few to give friends as well.