I think you would do better by buying Whiting hen capes. Brilliant quality, more mobility for a wet fly hackle and so much cheaper.Great colours, what supplier did you buy them from..?
Is the barb length on them suitable for size 10 wets..?
That is a very good deal. Anyone should be able to get 80-100 flies from a pack.
I get my capes from featheremporium - most are unpackaged but perfectly graded and much cheaper than elsewhere. He does packs and half capes too.
Also he’s one of the few flat wing saddle sources for your saltwater flies.