Semperfli Classic Waxed Thread 8/0. Fly Tying Threads made from continuous strands of modern manufactured polyester for supreme strength and minimal cost. Pre-waxed and ready to use with dubbing, fur and feather. The Classic Waxed Thread 8/0 240 Yards - Waxed Threads hold well on the hook and make adding dubbing and materials simple. Polyester based threads are very strong and have the best value on the market. Each spool has 20% more thread than competitors at the same price.