Komodo Habitat Moss Compact Brick, May Varynn--An ideal substrate to aid with reptiles shedding skin. n--One brick expands 7x its size when placed in water. n--Brilliant for providing humidity within a setup.nBrilliant for providing humidity within a set up, it provides an ideal substrate to aid with reptiles shedding skin and creating a natural environment. Each compact brick expands to seven times its size when placed in water. nHabitat moss can be mixed and matched with other Komodo substrates to mimic a reptile's innate surroundings. Komodo Habitat Moss Compact Bricks are easy to prepare and maintain.