Uni Shift Pipe Lock Drafting Pencil 0.5mm Black Body Smoke Accent & Strength & Deep & Smooth Uni 0.5mm HB Top quality Diamond Infused Leads [Nano Dia-40 Leads]& Pencil Eraser for Shift (Set of 5) Value Set With Our Shop Original Product Description Tip storage" and "knock lock mechanism" It is smooth and they are a spare lead which cannot break easily, and the profitable set which attached Nano Daia &5Pencil Eraser(hot product of Uni) together Finger does not slip, Roulette grip Because the center of gravity in the distal direction, the ease of writing stable