J.T. Industries BJT25006 Bird Seed Catcher, 12 by 18-Inch Bird seed catcher is an easy way to eliminate bird mess These elastic seed catchers completely enclose the bottom of the cage without the use of hooks or wire supports The elastic band allows the catcher to adjust plus or minus 1 to 2-inch the dimensions for easy installation Features completely washable and designed to fit most cages Measures 12-inch width by 18-inch length