STAEDTLER MARS DRAFT AUTOMATIC PENCILS - Automatic pencils are supplied with HB leads and feature clutch action advance. Has an adjustable lead hardness window to show the following lead hardness degrees: 4H, 3H, 2H, H, F, HB and B. Available in four, ISO color-coded, lead sizes: 0.3 mm - Yellow, 0.5 mm - Brown, 0.7 mm - Blue and 0.9 mm - Orange. Refillable with any standard fineline lead.