Tough, 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, and in regular sized spools, with 15 feet on each spool, or guide spools with 50 feet on each spool.