The Pigma professional brush Pen Series offers ultimate versatility from making super fine hairline to big, bold strokes, when drawing & illustrating. Flexible brush tips have a special "bounce back" quality, retaining shape & texture when drawing, and responds to changes in pressure or direction with smooth, accurate and consistent ink flow. The deep Black, archival permanent, pigmy ink quality ensures the marks will last a lifetime. Artists who prefer brushes will appreciate the flexibility of a portable brush Pen with continuous ink flow, avoiding the need to Dip the brush and carry messy inks. Manga & Comic artists, illustrators, and lettering artists, will enjoy the expressiveness of thin to thick strokes with ease and fluidity. The pigmy ink is fade, water and chemical resistant, will not smear or feather when dry, and will not bleed through most papers. Consistent ink delivery to brush sides and tip, flexible tip retains shape after use. Fb tip=fine tip, MB tip=medium tip, bb tip=bold tip. This two-piece set includes 2 pens of each tip size: fb, MB, bb, in Black ink. Acmi AP seal certifies that the product is safe to use as intended.