【Features】High-performance mechanical pencil lead: "Smooth," "Break-resistant," and "Smudge-resistant." 【Lead Diameter】0.5mm 【Hardness】HB 【Single Item Specifications】W20 x D7 x H78mm / 9.6g 【Materials】Body = Recycled POM, Cap/Cover = Recycled PC Well-balanced, high performance. Achieves a high level of balance between seemingly contradictory features such as "smoothness," "break resistance," and "smudge resistance." "Pentel Ain" offers improved smoothness compared to previous products. Even smoother with a new manufacturing process. The new manufacturing process uses a special oil in the raw materials, allowing the graphite and carbonized resin to smoothly break down during writing, resulting in a smooth writing feel. Case structure designed for ease of use. The highly operable case structure was completed through repeated surveys and behavioral observations. The case can be operated with one hand while facing upwards, reducing the risk of spilling the lead.