Oh another tip what I did to keep track of what size they are .05, .07 or .09 was to write on the eraser cap on the part you cant see the size .5, .7 or .9. That way when you pull the eraser cap off you can tell what size it is. I keep extra pencils on hand and give the customer the option of what size they want. They are quick and easy change out. You just got to keep track of the sizes.