The Waste Free seed blend is specially formulated to accommodate nut-loving birds. Consisting of 80% shelled oil seed and peanut, this seed mix has been made without "filler" seeds to reduce waste and keep your feeder area clean. There are no seed hulls to clean from beneath your feeder. The high concentration of oil seed and peanut helps provide the birds with maximum energy, which is especially important during migration and the cold winter months.