Zoo Med Terrarium Moss is a completely natural moss substrate for amphibians and wetland environment reptiles.  Great for use in humidifying shelters for all types of reptiles and amphibians. Terrarium Moss can also be used as an egg-laying and incubation medium for a variety of reptiles.  Available in 5 sizes including a mini compressed bale size for multiple terrariums: Small: 1.64L Medium: 2.46L Large: 3.28L Extra Large: 4.1L Mini Bale: 5.6L