The Tropical Terrain Compact Brick is a natural substrate ideal for woodland or rainforest habitats. Chosen by professional breeders worldwide, it encourages natural burrowing behaving. Each compact brick expands to seven times their size when placed in water. Komodo Compact Bricks are an organic sustainably produced substrate that is exceptionally good at retaining moisture. It is especially useful for animals that like a humid atmosphere and is an ideal substrate for tropical rainforest and woodland environments. It is an excellent choice of bedding for most species of insects and spiders.