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UTC 280 Denier Ultra Thread is a great fly tying thread for large flies when tying on large amounts of hair and synthetic fibers and for attaching dumbbell eyes or any fly tying that a large, strong tying thread is needed. UTC 280 Denier Ultra Thread is a favorite fly tying thread for large muskie flies and for large saltwater fly patterns. With an approximate breaking strength of #4 it is recommended for hook sizes #2 to #6/0.