Measure the floor of your bird's cage. Use heavy duty scissors and cut along the dotted line that conforms to your cage size. For cage sizes other than those marked, use a pencil to mark dimensions on backside of paper. Use scissors to cut to shape. Insert paper on bottom of cage. Stack multiple sheets on the bottom of the cage. When top sheet needs to be changed, remove top sheet to expose fresh Hartz Living Universal Gravel Paper. Just cut to desired size. Clearly marked lines for 8 3/4 x 13 3/8 inch, 9 1/2 x 15 inch and 11 inch round printed on each sheet. Can also be custom cut to fit other size cages.