About this item EXTRA LARGE SIZE: 45 ×34 inches, suitable for extra large dogs, like Golden Retriever, Alaskan Malamute, Labrador … indoor, for balcony 4 LAYER SYSTEM: 1. Top — Artificial grass; 2. Middle –Grid keeps the grass elevated & clean from the pee pads; 3. Middle — pee pads; 4. Bottom — Tray 2 ARITIFICIAL GRASS PADS: It is convenient for you to wash one while the other is available for use. Designed with reinforced tufts and a strong rubber backing to withstand the tearing of pet. The bottom of artificial grass features much more small holes, liquids can go through the grass pad quicker and won’t sit on the surface ANTI-BITE EDGE: The grass pad is especially edged so that there are no grass shreds if dogs bite. TRAINING PADS: 2 training pad included ,35.4×23.6 inches, very absorbent,leak-proof ; More pads can be bought by searching “ MEEXPAWS pee pads “ on Amazon EXTRA LARGE TRAY HOLDER: 45×34 inches,dried in the shade PACKING LIST : a) Artificial grass: 2 pcs; b) Grid; 1 pcs; c) Disposable training pad: 2 pcs; d) Plastic tray: 1 pcs