Aspen substrate is so good that we use it for our own snake breeding colonies this superb substrate is now commercially available in the uk it has been widely used for years by professional snake breeders made from shredded aspen wood it is especially good at absorbing odours and will also mop up almost twice its own weight of liquid being light and soft it is pleasant to handle and safe for animals aspen substrate looks attractive and has a pleasant natural odour specifically produced for