These permanent markers feature two different style nibs that give the artist flexibility. The Chisel-Fine markers have one end that has a broad (wedge) nib and the other a fine nib. The Brush-Fine markers have one end that has a brush nib and the other a fine nib. Both include alcohol-based permanent ink that is low-odor and will not bleed. Available in an extensive range of colors including primary colors, mid-tones, grays and metallics. Due to particular formulation, metallic colors require single nibs.