It's the window screen material from hardware stores (Home Depot or Lowes in US).
ExoTerra does not use tempered glass and many of us drill enclosures and fit them with drainage. So you can either drill them (search for videos in YouTube) or have a glass shop do it and install an aquarium type bulkhead with valve. You can do so in bottom pane or back one depending on your stand. Stay 1 in. away from edges and it should work fine.
Another no drill option is to use clear 1 in. plastic tubing. You set it so it reaches all the way to glass into a piece of aquarium filter sponge. Then when the water level rises, a flexible hose from small aquarium vacuum kit can go inside tube and use it to remove accumulated water. The piece of foam prevents dirt from clogging water flow. A furniture cap or similar prevents frogs from getting inside tube when not in use.





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