what's the format of mac system 3.x provided on this website

I tried to download https://winworldpc.com/product/mac-os-0-6/system-3x
The disk img works ok by dragging them into mini vmac,
but diskcopy 6.1.2 or 4.2 don't recognize them.
I wanted to create physical floppies from these images, so the only tool I could use is diskcopy (to make sure they are bootable).
Are these diskcopy images? I tried to load them by diskcopy 6.1.2 on system 7.5.3, but they always say that the image is corrupted and unexpected error of end-of-file.

Thanks a lot
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