Caran d'Ache 3mm HB leads (pack of 6) (reference 6377.350) are high-quality, soft graphite refills designed for 3mm technical and artistic mechanical pencils. Made in Switzerland with pure, high-density graphite, they offer a dark, velvety line that responds perfectly to hand pressure in sketching and freehand drawing. The protective tube ensures that the leads do not break during transport.