ZEBRA Sharpie DelGuard 0.3mm 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 study and tests. This product has been selected as a Japan PTA National Council Recommended Product, and is recommended for elementary school students making their Sharpie debut. (*May break when writing by knocking more than 4 times, or when using colored lead or lead darker than 2B) Lead diameter: 0.3mm