The Woodlink Audubon Thistle Sock Bird Feeder 1 lb. (NASOCK) is a functional feeder that perfectly attracts a lot of clinging birds. It is made of sturdy, woven nylon that is capable of holding 1 pound of thistle seed. It will surely attract a lot of Purple Finches, Gold Finches Redpolls and more! Once purchased, product comes with a drawstring for convenience in hanging.