"Poly" Rosborough recommended Nymo thread for tying his Fuzzy Nymphs because it was strong for its diameter and wound flat. The Nymo brand is no longer available, so as a service to fly-tiers, UNI-Products has introduced the same material as UNI-Bond. UNI-Bond is a size A, unwaxed, nylon thread. UNI-Bond is also superb for tying egg flies. Available in five commonly used colors and on 100-yard spools.