Lucky Reptile Coconut Bark Chips are coco chips pressed together to a brick. When placed in warm water the brick will swell up to about 5 litres of attractive coco chip substrate. This substrate is a very hygroscopic material, it absorbs water and raises humidity inside the terrarium. The Coconut Bark Chips maintains its attractive appearance and absorbing abilities for a long time. The coco chips are an excellent substrate for snakes, tropical lizards and large tortoises. Lucky Reptile Coconut Bark Chips are a natural product (100% bio degradable) and free of chemicals, pesticides or fertilizers.