Semperfli Classic Waxed Thread 12/0 - Fly tying needs great threads. Made from continuous strands of modern manufactured polyester for maximal strength and minimal cost. Pre-waxed and ready to use with dubbing, fur and feather. The Classic Waxed Thread 12/0 240 Yards - Black hold well on the hook and make adding dubbing and materials to flies simple with easy handling. Polyester based these are strong threads and have best value on the market with 20% more thread than competitors at the same price.