My thoughts are that these birds are about 3 Inches in Length, 2 Inches in Height, weigh about 4 Ounces each and are cloisonne *If* the base metal is brass, the seam between the colored ceramic is brass and possibly where they seam together (The Lid) is a brass seam. It's hard to tell from the photos, for that matter it's hard to tell sometimes if you're holding them and looking at them.
Oh yea, they do make a nice little paper weight or trinket/stash box!