Product Details The SemperFli Classic Waxed Thread 12/0 range of Classic Waxed Threads (CWT) is designed specifically for fly tying for midges, emergers, and dry flies tied on hook sizes 10 to 20. The Semperfli 12/0 70 denier range waxed thread is a unique 12/0 fly tying thread with thin, slightly twisted polyester strands to help it lay flat but can easily be split to create dubbing loops. SemperFli Classic Waxe Read More The SemperFli Classic Waxed Thread 12/0 range of Classic Waxed Threads (CWT) is designed specifically for fly tying for midges, emergers, and dry flies tied on hook sizes 10 to 20. The Semperfli 12/0 70 denier range waxed thread is a unique 12/0 fly tying thread with thin, slightly twisted polyester strands to help it lay flat but can easily be split to create dubbing loops. SemperFli Classic Waxed Thread 12/0 240 yards spools are ideal for crafting standard-size patterns for trout and salmon flies. Using SemperFli’s computerized spooling machinery, Classic Waxed Thread is leveled evenly on the spool to help avoid bird nests as you’re tying. SemperFli’s Pro Team of fly tyers determined the optimal amount of wax for each thread to securely hold materials without clogging your bobbin holder. The highest quality polyester tying thread goes into every Classic Waxed 12/0 Semperfli Tying Thread. In addition to these offers, you get complete color consistency with every batch. Great value with 240 yards (approx) per spool Lays flat on the hook The right amount of wax on the thread for fly tying Easy to split for dubbing loops Breaking strain: 17.25oz Ideal for hook sizes 10 to 20 Prop 65 Warning SEE LESS Video