No they are not.
They are thoroughly corroded rimfire cartridge cases.
Are you sure that the letter in the center of the big one is an E? It looks like it could be an H, which would mean that it's a Winchester case.
The small one looks like it could be a .22, the larger one a .38 or possibly a .44 rimfire. Hard to tell overall.
EDIT IN - No, you're right, it does look like it might be an E, which could stand for Eley, a British manufacturer.
Where did you find these?
Judging by your IP address, it looks like you're posting from somewhere in the United Kingdom, so an E would be a good bet for that cartridge.