Uni-ball Alpha-gel Mechanical Pencil Rose Pink 0.5mm (M5618GG1P.66) & Mechanical Pencil Leads 0.5mm Nano Dia, 40 Leads Value Set Grip - soft and flexible alpha-gel (Soft cushion grip) Shake it to extend the lead. Can Lock the lead when you are not using 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.(HB 40 Leads)