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The M41 lead refills are designed purely for Lamy mechanical pencils
HB Lead grade
3 packs of 12 (36 leads)
3 packs of 12- Lamy M41 Pencil Lead - 0.5 mm - HB
3 Packs Of 12 Lamy M41 0.5mm Mechanical Pencil Lead Replacement Refills - B000FA5E7Y