Chadwick's 477 Substitute is a very similar product to the original wool braid that was used in the famous Killer Bug fly. This is the best substitute we've ever seen.
Killer Bug fly was designed by Frank Sawyer. It can be used as a general purpose bug when targeting fish in both still and running water that are feeding on freshwater shrimps and grubs.
Package includes approximately 4 yards of wool braid (3 x 1,2 meters). Braid diameter is about 0,7 mm.