Nymo Nylon Monocord Thread Fly Tying thread. Available in 12 different colors, and 4 sizes (000, A, B, D). 100 yd Spool Sizes 000 and A 3 oz Tube Size 000 6 oz Tube Sizes A, B, D Size 000 1224 Brown 2780 Yellow 3743 Lt Green 4234 M Green 7237 Blue Size A 0450 Bright Red 0538 Red 0953 Orange 1224 Bro...