Made in the US by Pine Tree Farms, these cylinder blocks can be used with our hand made Cylinder Feeders. It contains a mixture of high quality mixed tree nuts including pecans, Valencia peanut kernels, sunflower hearts, dried fruits, and natural gelation as the binder. They last for quite a long time! We get at least two weeks out of the small one and a month and a half out of the large cylinder. We attract a lot of cool species with these blocks including Woodpecker, Thrasher, Cactus Wren, Mockingbird, Cardinal, Finches, and more.