IRIS Mesh Training Pad Tray Small will fit 12.9" x 17.32" training pads. Large will fit 17.32" x 23.23" training pads. Mesh sheet is removable. Material: Polypropylene. Made with ABS resin. Small: 14.5"L x 19.3"W x 1.3"H; Large: 21.65"L x 25.59"W x 1.6"H