Pentel Graph Gear 1000 Automatic Drafting Pencil, 0.3mm Lead Size, PG1013  + 4 Refill Erasers + Strength & Deep & Smooth Uni 0.3mm HB Top quality Diamond Infused Leads [Nano Dia 15 Leads] It is smooth and they are a spare lead which cannot break easily, and the profitable set which attached Nano Daia (hot product of Uni) & 4Refill Eraser together The pencil for the pro whom the world accepts Chiseled metallic grip inlaid with soft latex-free pads provides writing comfort Superior drafting pencil for general and technical writing