It is a  mesh bird cage net for bird cage. Stretchy seed catcher fits any bird cage to help eliminate messy seed scatter on your floor. Soft and airy fabric allows for air circulation and does not block out the light so your bird's cage interior remains bright. Washable Features: Material: Gauze Color: Black/White Size:  S : Perimer 20-35cm, Altitude 18cm          M : Perimer 33-50cm, Altitude 20cm          L : Perimer 45-71cm, Altitude 30cm Package Include: 1X Cage Mesh Net