Robin,

Gudebrod 'E' is pretty heavy thread. Much heavier than I'd use on any rod.

Might make a good body material, but you'd not want to try to tie flies with it.

I 'think' that the Holland 'C' is also sized the same as the Gudebrod wrapping threads, and if so it's way too thick for tying chores. Could be wrong, though, but you might find a web site for Holland to check it out.

Good Luck!

Buddy