The upside-down suet feeder design naturally eliminates nuisance birds like blackbirds and grackles that are not comfortable hanging upside-down to eat. Woodpeckers, titmice, nuthatches, and chickadees can all feed comfortably upside-down from this feeder. Constructed from naturally rot-resistant premium Cedar using stainless steel screws, this feeder is built for years of birding enjoyment. This feeder holds 1 suet cake.