Favored for its superior strength and resistance to fraying, 3/0 Uni-Thread comes conveniently pre-waxed and measures a perfect 220 denier. Perfectly suited for heavy handed fly tying, Uni-Thread is carefully constructed from spun polyester and exhibits very little stretch under tension. Semi-flat when laid or easily twisted round at the tier's discretion, we offer 3/0 Uni-Thread in several popular colors certain to please.