Perky Pet Clear Window Bird Seed Feeder 15 in. (348) has a 1 cup capacity and can hold any type of seed or mix for different birds. It has a crystal clear design making it fun and easy for you to view the feeding birds. No need to buy any hardware, it's all included. It's easy to clean and fill. It is packaged in a display tray. It has a wide open compartment - small birds can feed at the same time. This product can be attached to any window for excellent viewing! You can give one to your friends who will be happy to receive one! Perfect to own a couple around the house windows to invite more birds.