Mermaid Hyli has them and I know Oceana does too. I have the smaller ones on my bracers but when I had the larger scales YES, they were very much fragile. I can't compare them to rounded scales but they ripped the first time I put the bracers on (granted my hands are a 3+ inch different and it might not be as bad on a tail) but they are fragile. If you look at the picture above you can kind of see how thin they are on the green scrap of scale, which is tail-size.