Feathered Friend Black Oil Sunflower Seed wild bird food is a high-energy, high-protein, year-round favorite to attract a variety of birds to your feeder. This seed appeals to bob-whites, cardinals, chickadees, finches and towhees. For use in hopper, tube, platform, and window feeders. Size is 20 lb. Also available in 50 lb. and 5 lb.