Troutline Catgut Biothread

Product Description

We’re excited to offer you one of the best fly tying materials for creating lifelike nymphs: Catgut Biothread. This exceptional material is known for its unique transformation from opaque when dry to milky translucent once wet. Its natural stiffness can make it slightly challenging to work with when dry, so we recommend wetting it before use.

To prepare it, simply soak the material in warm water for 3-5 minutes—only the portion you intend to use. The color will shift from opaque to a beautiful milky transparency, enhancing its natural effect.

When multiple threads of different colors are used, your nymphs will have subtle shading in the underbody, creating a stunning depth of color.

Catgut Biothread is truly a magical material, perfect for crafting durable and realistic bodies for nymphs and emergers. Its versatility and texture make it a must-have for any serious fly tier.

Catgut Info and Details:

• Length: Approx. 50 cm per bag
• Size L: For hooks #6 and #10
• Size M: For hooks #10 and #12
• Size S: For hooks #14 and #16
• Size XS: For hooks #16 and #22
• L = 0.7mm
• M = 0.5mm
• S = 0.3mm
• XS = 0.18mm
• Specially treated for long-lasting durability in water

Extra Info:

• Also used by traditional salmon fly tiers to make the loop for super flies (especially in size XS and sometimes size S).

Read and Learn: