Sustainable Sourced Pure Kiln Dried Aspen Fibres. Pettex Reptile Substrates Are The Ideal Way To Set Up A Reptile™S Home. When You Need To Make Your Reptile Happy And Comfortable There Is A Substrate To Replicate Their Natural Habitat. We Only Use Carefully Selected Substrates From Around The World From Sustainable, Renewable Sources.. Soft, Odourless And Highly Absorbent. A Popular Natural Choice For Herpetoculturists For Use As Bedding Or Nesting Material. Heat-Treated To Reduce Bacterial Contamination And Improve Absorbency. Ideal For Burrowing Pets And Dust Extracted Before Packed For Added Ease Of Use.