Beautiful antique French gilded bronze pediments. The gilt on these pieces has a warm aged finish. Two pieces have small holes and two have pins. Most likely "C" and "D" were used as furniture ornaments and they are Louis XVI style pieces. These would be a lovely finishing touch for furniture and "A" and "B" would look wonderful on a wall or over a picture as well.
As with all antique and vintage items you should look closely at all of the photographs to ensure that any age related blemishes or faults are acceptable to you.