Songbird Selections 11417 Finch Sock Feeder and Wild Bird Food, 13-Ounce Exclusive formula has been proven to attract up to 2x more finches plus other small songbirds Attracts Goldfinches, Purple Finches better than thistle alone Pre-filled sock is ready to hang--great for trying out a new blend Developed by ornithologists using only high-quality ingredients--no added fillers Results may vary by region and/or season Upgraded Easy-to-Use Velcro Seals