RIO POWERFLEX WIRE BITE TIPPETTOUGH, FLEXIBLE, NYLON-COATED WIRE THAT IS SUPER EASY TO TIE A KNOT WITH - IDEAL FOR SHARP-TOOTHED CRITTERS LIKE PIKE, MUSKY, BARRACUDA AND BLUEFISH.RIO's Powerflex Wire Bite Tippet is a tough, flexible nylon-coated wire that's perfect for those sharp toothed critters. This knot-table, braided wire is supple enough to tie directly to the fly. Available in three size options; 20lb, 30lb & 40lb, with 15 feet on each spool.20b (0.016") to 40lb (0.024") - 15 feet per spoolIf you're looking to buy wire bite tippet, then you probably do not need a whole lot of advice. Just guessing. However, if you would like some advice, here goes it. Pros:This wire tippet is very supple and ties better knots than some super hard, large diameter nylon. The best knots for mono to wire are - Double Uni, Slim Line Beauty and the Albright (below). Can be tied directly to fly with various loop knots - non-slip mono loop is great.Can also be tied to swivel for quick fly changes.Hook large toothy fish and worry less. Cons:Mono-to Wire knots can be a challenge at times versus buying a pre-made leader like Toothy Critter.Without a swivel, leaders will progressively grow shorter with each fly change, meaning more time on knots, less fishing.