most interesting to me, they are made of a much finer wire than the same size of klink hooks. being a heavy-handed beginner, i find it a challenge to avoid pulling the things this way and that as i tie.
That is when I release the vise's grip and throw that hook [and the rest of them] away. If you can flex a hook that easily with 6/0 thread, imagine what your best fish of the year is going to do to it. If there is one thing I learned [the hard way!] its to test all hooks before wrapping thread on them. A little side to side pressure to see how the temper is.
I once bought a bunch of hooks from a fly shop in Roscoe that started stocking them. The owner told me they were new, and he has been tying on them for a week and loved them. They were inexpensive, had a similar look to the Mustads I have been using all along and figured I would give them a shot. I straightened one out on the very first fish I hooked, and not a big fish at that. After a crude strength test on-stream, I decided to never use them again. Every dog-gone one was bending like a paperclip.
Next time at the store I asked him if anyone complained about his flies straightening out and he looked at me deadpan and said "nope". 6 months later he had a different line of hooks hanging on the pegboard!
Long story short, check first, be happy later. CJ