Reptile Sciences Terrarium Sand, 10-Pound, Black 100% Digestible Calcium Carbonate Prevents Internal and External Abrasions 100% All-Natural Orbicular Grains; Silica & Phosphate-Free Significantly Lowers Risk of Impaction in Reptiles Contains Essential Strontium, Potassium and Magnesium Natural Odor Neutralizer; Creates An All-Natural Environment