Penn Plax Vertical Bar 2 Week Seed Feeder is a vertical seed feeder that holds up to 2 weeks worth of food. For use with small birds like finches and parakeets. Small enough to fit in between the wires of your bird cage. A narrow bottom allows less seed to be accessible to the bird at one time which lowers the amount of food waste. Hold up to 2 weeks worth of food Narrow bottom for less waste Great for small birds Fits snug between the cage wires