Great non-toxic fly marker pen for coloring just about any fly tying material. For coloring (dying) foam bodied flys & foam poppers, plus feathers & furs right at the bench. One end has a wide-tip for general use, the other is a fine-tip for marking (barring) feathers, or drawing gills, eyes and other details on foam poppers and sliders. Double ended design with both a fine and a chisel tip. Durable and long lasting. Please specify color.