A completely natural product pure coco fibre. Peat free. No additives. One of the ingredients we use in our TortoiseMIX You will receive 4 x blocks with each block making 240 - 280 litres of substrate. To make add warm water and the block will expand. This is ideal bedding for tortoise. . This is ideal bedding for tortoise. We mix ours with soil however this is completely fine to use on its own. It also a great growing media. We grow our plants in this too.