These liners perfectly fit the hatching drawer of all Sportsman incubators 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 with a mild germicide to control bacteria 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”