UNI 0.5mm HB leads (12-pack) are the standard refill for 0.5mm mechanical pencils for everyday writing and technical drawing tasks. The HB grade offers the perfect balance between hardness and line depth, ensuring crisp lines that are easy to erase. The high-density graphite formula significantly reduces the risk of lead breakage during intensive use. The carrying case protects the 12 leads from drops and makes refilling the pencil easy. Essential for everyday schoolwork, academic work, and office tasks.