Catgut Biothread Body Material

4.50 out of 5


SKU: TL-CATGUT Categories: ,


We have the pleasure to offer you one of the best fly tying materials for tying nymphs!! Troutline Catgut Biothread. This fantastic fly tying material has an opacity aspect when it’s dry and when gets wet it becomes milky translucent. When it’s dry the material is stiff and a little bit difficult to work with so we recommend that it should be used wet! For that, you should keep the material in warm water for 3-5 min. The color will change from opaque to milky transparent color.
Different threads under different catgut will give the underbody different shades of color. Fabulous for making bodies on nymphs, larva and emergers.
Technical Details
Approx: 50cm/bag
Size L is for hooks #8 and #10 L=0.7mm
Size M is for hooks #12 and #14 M=0.5mm
Size S is for hooks #14 and #16 S=0.3mm
Size XS is for hooks #16 and #20 XS=0.18mm
-Special treated for long durability in water.

Additional information

Catgut Size

XSmall (Recommended Sizes #16-20), Small (Recommended Sizes #14-16), Medium (Recommended Sizes #12-14), Large (Recommended Sizes #8-10)

Catgut Color

Caddis Green, Transparent/Natural, Olive, Green Olive, Olive Brown, Ginger, Cinnamon, Brown Cocoa, Brown

2 reviews for Catgut Biothread Body Material

  1. Rated 5 out of 5

    Barry (verified owner)

    This product is relatively new to me. It was highlighted in a flytying article and I was curious. I think it works well but the test will be when I fish. I’m glad I found it in the USA because I was skeptical about purchasing from overseas. It’s the same product and well priced. I found it works best over silk and a pre-painted white shank.

  2. Rated 4 out of 5

    rhy (verified owner)

    Great stuff for caddis pupa and some other nymphs. Check put the articles and videos on the web detailing how to tie with it (soak in water first). It shrinks when dry but soaks up water and has a realistic translucency when wet.

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