Rite in the Rain Weatherproof Red Lead Refill (No. 99RR) LEAD: Break resistant Red - B (No. 1) refill for Rite in the Rain Mechanical Pencils WRITING: Thick 1.1mm lead for smooth bold markings. STORAGE: Store extra leads in mechanical pen barrel below the erasers FITS: Specifically fits all Rite in the Rain Mechanical Pencils PACK: 12 leads per refill pack.