Formulated to attract cardinals. Birds with prominent, seed cracking bills, like cardinals, easily crack in-shell seeds like sunflower, safflower and buckwheat. These seeds preclude smaller birds with finer bills yet attract larger, colorful jays and cardinals. Contains black oil sunflower seed, striped sunflower seed, safflower seed, sunflower kernels and buckwheat.Only the finest and freshest ingredients. Scientifically tested, developed and marketed to appeal to a wide variety of wild birds. Free of fillers. Better seeds and better quality mean more birds at your feeder - again and again!