This seed and aggregate catcher system can be clipped to any bird cage panel with 1/2″ or larger wire. Debris falling within 4″ of the cage will be collected into the seed catcher, then all you have to do is unclip the seed catcher from the bird cage to dispose of the waste. These seed catchers are sold by the foot and are cut to length for your panels. Our bird cage seed catchers are only functional when used with wire.