A brush-tipped Pigma pen for expressive, variable-width line work. The flexible felt brush nib swells and tapers with pressure — thin on a light touch, broad on a hard press — for lettering, hatching, fills and loose sketching, all in the same waterproof, fade-resistant archival Pigma ink as the rest of the line. Pairs naturally with the fixed-width Micron for inking and shading.