I would guess they are an inch wide and an inch and a half long I'm at work and can't give exact right now. they are metal and plastic. not sure what hook ins are sry.
Yes thank you! earring posts...is that the correct way to say it? Not sure...anyways, thanks for the info. They are beautiful. I was curious because they looked like they were made out of seashell because of the back. *Good Luck*