ZEBRA Sharpie DelGuard 0.5mm 1 pc. DelGuard mechanical pencils are designed to prevent lead breakage. The built-in spring and guard parts protect the pencil lead against breakage from any angle, no matter how strong the writing pressure. A built-in spacer prevents lead jamming. By being able to use the pen without worrying about lead breakage or lead jamming, users can concentrate on their writing in important situations such as daily work, study, and tests with peace of mind. (*Possible breakage may occur when writing with more than four knocks, or when using colored leads or leads darker than 3B.) New environmentally friendly packaging that reduces the amount of plastic used. Lead thickness of mechanical pencil: 0.5mm