ProMarkers can be used for a variety of materials including hair, fur, and synthetics. These fly tying marker are ideal for hackled flies, streamers, two-tone nymphs, perch imitations. Each pen is double-ended, with a broad chisel nib for large area fills and a fine bullet tip for more detailed work. ProMarkers contain alcohol-based inks, blend easily. In black, henna, ruby, orange, canary, lime green, olive green, ice gray, cyan, Prussian blue. UK.