Gee, I wish they would. CD's are almost indestructible. I keep computer backups on CD's and DVD's, and they're very difficult to destroy when I want to get rid of obsolete backups. I can fold them in half and they spring back rather than breaking. I use heavy duty rescue shears to cut them up.

They're not great as signal mirrors, but they certainly don't break. Ironically, the best signal mirrors are glass, and they're quite fragile.

Kevin B.