Coir Block Substrate is an ideal substrate for burrowing species that live in a humid environment or require humid hides and tunnels.It's composition allows for moisture to be retained well.Naturally produced from coconut husk it is 100% natural and organic. It is also biodegradable, non toxic and non abrasive.To hydrate the substrate brick simply place into a container with approximately 2 litres of water and leave for an hour or until it is fully expanded.A block expands to approximately 9 litres. *Disclaimer:This product is manufactured by a third party company. Please be sure to check any foreign objects are removed before allowing in to any animal enclosure. Due to the natural nature of this product there can be slight variations in the products specifications.(These are posted from us in packs up to 3 so if multiple are ordered they will arrive in seperate parcels)