Exo Terra Coco Husk is made from compressed coconut husk from the plantations of tropical Asia. This ecological substrate is ideal for increasing humidity in the terrarium and is totally safe for frogs, salamanders and burrowing or digging animals. 7qt - 7L. Key Features : 100% natural substrate Ideal for natural terrarium set-ups Increases humidity in terrariums Stimulates natural digging and burrowing behavior,