Uni Shift Pipe Lock Drafting Pencil 0.9mm Red Accent & Strength & Deep & Smooth Uni 0.9mm HB Top quality Diamond Infused Leads [Nano Dia-36 Leads] Value Set With Our Shop Original Product Description 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