A clay substrate that can be shaped to your liking, while still allowing reptiles to dig tunnels and burrows just like they do in the wild.Watch your reptiles perform natural digging behaviors; mold and create multi-level terraces and burrows in your reptile’s terrarium. Excavator® holds its shape so burrows and tunnels won’t collapse. All Natural! No added dyes, colors, or chemicals.All natural! No dyes, colors, or chemicals addedFormats:10lbs XR-10 Excavator® Clay Burrowing Substrate20lbs XR-20 Excavator® Clay Burrowing Su..