Uni Shift Pipe Lock Drafting Pencil 0.3mm Light Blue Accent & Strength & Deep & Smooth Uni 0.3mm HB Top quality Diamond Infused Leads [Nano Dia-16 Leads] Value Set Tip storage" and "knock lock mechanism" Finger does not slip, Roulette grip Because the center of gravity in the distal direction, the ease of writing stable 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) together