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This product is being discontinued and is marked down for clearance while supplies last. Incredibly strong GSP fly tying thread in a size for smaller flies. Measures 75 denier (2/3 the weight of UNI 8/0) and 68 oz. breaking strength (over 4 times UNI 8/0). Great for spinning deer hair. Available in black or white, 50 yd. spools.