Rio Powerflex Wire Bite Tippet - Guide Spool - 50ftTough, flexible, nylon coated wire 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.