Audubon Park 10-pound Pouch Bird and Critter Seeds and Grains Black Oil Sunflower Seed is a nutritious source of high-quality protein. Black-oil sunflower seed is smaller than the grey-striped variety, with a thinner hull and higher calorie content. Premium quality 100 percent natural black oil sunflower seed is preferred by most wild birds. FreshLock technology retains the flavor and freshness of the premium natural seed. Comes in a convenient barrier pouch that can be stored upright.