ProRep Straw Bedding can be used for tortoises as well as many other large snakes and lizards that originate from arid habitats. ProRep Straw Bedding is a 100% natural substrate produced in the UK that is used in enclosures which require a dry substrate. The straw is collected after harvesting and chopped before being compressed into a safe, non-toxic pellet. If straw pellets get wet then they break down into a harmless, soft fibrous material and can be safely eaten. Because they break down they are not likely to cause impaction if eaten. DIRECTIONS:Spread the substrate evenly over the bottom of the enclosure to a depth of at least 1-2" (2.5-5cm). Spot-clean daily and completely replace every two or three weeks, or more frequently if it becomes heavily soiled or wet. This substrate should not be used wet. If you are using an under-tank heat mat as your heat source, do not use a thick layer of Straw Bedding as this may cause the heat mat to overheat. Please refer to the heat mat manufacturer's instructions for more information.