Heath's Observatory Dome feeder is aptly named, made with clear plastic and a large dome. The dome's height is adjustable allowing birds to fit at the feeder and not all the neighborhood squirrels. You can easily see when it needs to be filled and who's munching on the seed from all angles. It holds over one-pound of mixed seed and the drainage holes in the base lets water drain so the seed doesn't get soggy. construction comes with steel hardware.