Aerospace technology has been utilized to produce our TUF-LineŽ XP fishing line. Tension Lock Technology TUF-LineŽ XP is produced under high tensions allowing more compaction of the fibers during the finishing process. TUF-LineŽ XP is more compact, smaller in diameter, packs better on reels, offers better knot performance, casts longer, reduces rod tip wraps, and boasts higher abrasion resistance. Western Filament, Inc., creator of the famous "W-40" lines and the superbraid phenomenon, has been producing quality braided lines for over 50 years. Designed by fishermen for fishermen, these superior braided lines will capture the confidence of the most discriminating angler.