Special graphite leads – ideal on wet materials. For deep black marking especially on wet timber. New formulation: non-toxic and environment friendly. For refill or exchange. In the convenient and sturdy plastic box. Rectangular leads with 2 x 5 mm profile, 150 mm long. 12 refill leads each in a refill box for secure storage. Lead box with two wings to open for an easy and intuitive handling Corresponding pencil: Pica Big Dry.