Wool Yarn (alpaca) has the same quality as Chadwick's 477 Substitute, except this comes in different colors.

You can use this material in many different wet fly patterns as a body and tail material. The most legendary fly patterns using wool yarn are Black Zulu and Red Tag, where tag is made of wool and many larvaes and streamers, where whole body can be tied from wool yarn. 

Package includes approximately 4 yards of wool braid (3 x 1,2 meters). Braid diameter is about 0,7 mm.