I also agree that paper is easier and better for larger constrictors. Even my 2 female 6ft plus Dumeril's Boas, 4ft plus male Dumeril's Boa, almost 8ft female Redtail Boa, 4ft male albino Redtail Boa, 10ft albino Burmese Python, & pair of Leopard Geckos are all on paper. Most of my colubrids are on aspen. My Ball Python, Argentine Rainbow Boa, Argentine B&W Tegu, Redfoot Tortoise, & 2 baby Burmese Pythons are all on cypress mulch (for humidity). BUT I freeze all bedding for at least 48 hours before use, because I have gotten mites from the substrate. My Kenyan Sand Boas, Uromastyx Lizards, Sulcata Tortoises are in play sand (also frozen as precaution). My Crested Geckos, Australian White's Treefrogs, Green Tree Python are on all natural unfertilized soil (also frozen, and after put in their cages added about a dozen night crawler worms to help naturally keep soil turned.