UNI Products 3/0 UNI-Thread offers a superb, easy-to-work-with foundational thread for a wide range of patterns tied on hooks larger than size 12. Strong yet supple, designed especially for general fly tying, UNI-Thread consists of tightly-bound, continuous polyester filaments. UNI’s exclusive ultrathin waxing process greatly reduces wax buildup in your bobbin tube. 100-yard spool. Easy-to-work-with general fly-tying thread Ideal for hooks larger than size 12 Made of continuous polyester filaments Ultrathin wax coating reduces bobbin clogs.