Zoo med terrarium substrate mesh is designed to be used in conjunction with Zoo Med Hydro Balls to create an artificial water table within your terrarium.
The substrate mesh is placed between a layer of the Hydro Balls and a regular humid terrarium substrate. This prevents the two substrates being mixed up but still allows water through the mesh.
Ideal for use in very humid environments the mesh is available in two sizes and can be cut to fit your tank. Take a look below.