The bright red cover attracts hummers from a distance and removes easily so the bowl can be cleaned quickly and thoroughly. Polycarbonate construction. The built-in ant moat blocks crawling insects and the patented Nectar-Guard tips on the feeding ports prevent bees, wasps, and other flying insects from feeding at the ports. These two patented features combine to make the Ultra the most insect-proof feeder on the market. Nectar Guard tips included. 4 feeding ports. 12 oz capacity.