Staedtler 250 07-HB 0.7mm HB Replacement Leads. Staedtler Micrograph Super 250 Fineline drawing leads for all lead holders. Features 0.7mm HB leads, Hi-polymer Fineline leads, extraordinarily high resistance to breakage, maximum elasticity and opacity. Supplied in tubes of 12 leads. These are mechanical pencil leads for use on paper and drawing card with high break resistance due to flexible lead.