The Opus GardenJewels 20 oz Glass Hummingbird Feeder features a reversing funnel cap (makes filling and cleaning easy), tempered clear glass nectar container, four sculpted flower feeding ports with bee guards, and, as the name implies, 20 oz. nectar capacity. These innovations make for one of the most economical and convenient feeders on the market! The clear glass reservoir makes it easy to monitor nectar levels and unscrews easily from the feeder base for quick cleaning and filling. Remember to clean your feeder at least twice a week, more often in very warm climates or seasons. The Opus GardenJewels family of bird feeders are on the cutting edge of birdfeeder technology, providing constant innovations to the overall efficiency of your bird feeding. Opus GardenJewels Hummingbird Feeder models are designed to resemble nectar bearing flowers, looking irresistible to hummingbirds when used in a flower garden or treeallowing you to discover the beauty and fascinating behavior of the elusive hummingbird.