Carib Sea SCS05710 Reptiles Calcium Substrate Sand, 5-Pound, Natural White, Pack of 8 Ideal for true chameleons or any tortoise, snake, lizard, arachnid or insect that comes from an arid or semi arid environment Made of aragonite, the most soluble form of calcium carbonate Features 100 percent edible and easily digestible and naturally spherical grains that will not scratch valuable animals inside or out Contains strontium and magnesium while being free of silica and phosphates Available in natural white color; weighs 5-pounds