Wild Delight 383010 Prefilled Finch Sock Feeder, 13-Ounce Prefilled finch sock feeder Contains only the finest premium grade Nyjer seed, an oil seed preferred by finches and other birds Features all-in-one feed and feeder, easy to use; feed all year long Preferred by all species of finch; use in tube feeders (small holes) or finch or thistle sock feeders Easy to use and economical