Bird Seed Waste free is waste free bird seed because there are no shells. Bird Seed Waste free Gourmet 20 lb bag contains black oil sunflower kernels and mixed tree nuts. This mix recipe really brings them in! And with no shells there is nothing to pay for or pick up later. Get a good look at woodpeckers of all sorts, chickadees, nuthatches, male & female cardinals, blue jays, etc. Excellent value and treat for most all backyard wild birds. Put in standard feeders and enjoy! See the difference!