SKILCRAFT 7510-01-587-3931 Lead Refill, 1.3mm Diameter x 60 mm, Black (Tube of 12) 100 percent biobased tube made from renewable corn starch Empty tube is compostable when placed in composting conditions One piece flip sliding tube cap, prevents lost cap Measures 1.3-millimeters diameter by 60-millimeters length Made with pride by Americans who are blind