The Pigma Brush Pen Set includes 3 creative brush pens for illustration, journaling, sketching, stamping, comics and other applications. The extra durable, robust and memory nibs are made of FB (a tough plastic polyacetal material), MB (a tough nylon material) or BB (a tough porous polyethylene material). The durable brush tips respond instantly to changes in pressure or direction, delivering silky smooth, precise and consistent ink flow. The unique Sakura Pigma ink does not bleed through paper and is permanent, waterproof, quick-drying, pH neutral and does not bleed. Contents of this PIGMA Brush Pen set: 1 Pigma Brush Pen FB, 1xPigma Brush Pen MB, 1xPigma Brush Pen BB.