Everything you need to know about threads.

Here is a link to a great atrial on threads. A comparison chart is included. It's a great read and reference.

https://globalflyfisher.com/tie-better/fly-tying-thread-table?fbclid=IwAR0W_ORYYbTtrQTbf50n9PjopGpFRLmP9D5mYUxsA-uxblexBEtqYtH_Dkk#explanations