These trays perfectly fit the #1502 & #1550 & #1202E hatching drawer and provide a cushioned liner for the eggs as well as firm footing for newly hatched chicks. These liners are 2-ply heavy paper. The top ply has been treated to control growth and suppress odors. Highly recommended, these disposable tray liners make for a quick and easy clean up of the plastic hatching drawer. Liner size 13.25” X 27.69”