Stack your animal bedding material on a shelf-dry, sanitary, and compacted until you need it. When needed, just add water and nature does the rest. This 8" x 4" “brick” of super-compressed bedding expands in water and produces enough bedding to cover a 40-gallon terrarium. The compressed bedding is 100% natural coconut fiber which is ideal for iguanas, lizards, snakes, turtles, chameleons, tarantulas and other reptiles. It also works well for egg incubation studies and as worm compost.