Catgut Biothread
One of the best materials for tying killer, super-realistic nymphs. It is opaque, solid-colored when dry, and becomes milky translucent and shiny when wet.When submerged in water, it becomes very soft, flexible, and stretchable, which makes it super easy to work with. As it soaks in water, its volume also increases, giving a plump appearance to the fly. The most amazing benefit of using this material is the way it looks in water – flies tied with it look extremely authentic, have lifelike texture, and super-high shine. The material has been treated to extend its durability under water. To apply, soak the part you want to use in warm water for 3-5 minutes prior to tying. The color will change from opaque to more milky and transparent and the material will be super-flexible and easy to wrap. When the fly dries, the body will go back to its solid-colored state. By using various colored threads underneath it for the underbody, different effects can be achieved as the color peaks through the wet material. About 50 cm long (about 20”), comes in three diameters and a wide range of colors.
- Extra Small (0.18mm) – for hooks #16 and #20 Small (0.3mm) – for hooks #14 and #16 Medium (0.5mm) – for hooks #12 and #14 Absolutely perfect for making bodies for nymphs and emerger flies.Also a great choice material for making loops on traditional salmon flies (small diameters, in particular, XS and S)