Hareline UV Galaxy Mop Chenille is excellent for all of your mop fly tying needs. It has flecks of colored mylar scattered through the fibers for just a hint of flash attracting fish in low light conditions. Suitable for a variety of flys from panfish jigs to larger salmon and steelhead flies, mop flies, wooly buggers, and nymphs.. This chenille will not fray when cut and can be tapered with a flame. This chenille is also available in mottled colors! All colors fluoresce. 4 yards in each package.