Garden Chic Thistle Sock Instant Feeder comes prefilled with Nyjer Thistle Seed. Thistle Seed is the most desired seed of Finches as-well-as other small birds. Simply unwrap and hang to create a Goldfinch feeding frenzy. Once depleted loosen the Garden Chic. Thistle Sock Instant Feeder and refill with more F. M. Brown"s Song Blend Nyjer Thistle Seed.