The Lamy M 41 lead refills come in a pack of 12 individual pencil leads and are suitable for Lamy mechanical pencils that take 0.5 mm leads. Made from strong, high-quality HB lead, the M 41 refills resist breakage and flaking for a smoother and more consistent writing experience. 0.5 mm pencil lead HB lead hardness 12 leads per pack .
eBay