Great new size is ideal for size 16 and smaller flies Very flexible and translucent Available in 18 colors Weight Model Number SK4000 Wapsi’s Sow Scud Back is a dyed, translucent, highly elastic material that is ideal for use on nymphs, scuds, sowbugs, crawfish, caddis, and midge patterns. Sow Scud Back can be used as a wing case, segmented abdomen or wrapped fully over the body of the fly. It is an essential material for tying Czech style nymphs. Due to the overwhelming demand to add a small size, Wapsi is pleased to announce the introduction of their 5/64? (2mm) size. This size is perfect for tying size 16 – 24 flies and makes some of the most incredible midge patterns you have ever seen.