This Kaytee super finch sock is an instant feeder filled with our Kaytee ultra wild finch blend. It is a blend of four select ingredients, developed to call on the birds' sense of sight, which they naturally use to find their food. Kaytee has applied this knowledge of visual attraction to the development of this seed blend. The result is that the ultra wild bird blend is preferred 3-to-1 when compared to Nyjer seed alone and attracts 60 percent more birds in national trials.