Catgut Biothread- This material is an excellent material for abdomens on nymphs, larvae, and emergers, and pupae. When dry it is stiff and somewhat difficult to work with. Put it in a cup of water for 5 minutes before tying with it. When wet, it increases in volume (gets more plump) and is super realistic. Approximately 3 feet per packet.
*Size Medium (M) is for hooks #12-#14 M=0.4mm (0)
*Size Small (S) is for hooks #14-#16 S=0.35mm (2/0)