Finch Bird Seed is a Songbird Finches Favorite blend. Finch Bird Seed 20 lb bag contains a mix of thistle seed and sunflower chips that is small enough to flow through traditional thistle feeders. Thistle Bird Seed and sunflower chips is the seed that attracts the finch family. The Goldfinches, purple finches, pine Siskins and common redpolls will visit a feeder stocked with Thistle seed. It is necessary to use a thistle tube port or fine meshed feeder specifically made to deliver the small, narrow Thistle seed. A great attracter of Goldfinches! If you have not seen a Goldfinch in sunlight, you are in for a sight. You may think someone's yellow canary got loose and is at your feeder! Beautiful!