3.5L Bee Frame Deep Feeder Plastic Water Sugar Syrup Feeding Ladder Beekeeping3. 5L Deep Frame Bee Feeder by Rooster Farms provides additional food resources to your bees in the winter months, like sugar, syrup or water when pollen may not be as prominent. A frame feeder, as its name suggests, fits inside of a hive in place of one or more frames in the brood nest. The feeder is comprised of two mesh ladders or tubes, which allows bees to safely access sugar or syrup, keeping the growing nucleus colony healthy and nourished.