Exo Terra's Desert Terrarium Sand is natural real desert sand with no added dyes or chemicals. The sand has been sifted to remove impurities and to obtain a homogenous sand grain size. Natural desert sand, no added dyes or chemicals Creates a natural and attractive desert environment Excellent heat conductor Stimulates natural digging and burrowing behavior Suitable as egg-laying substrate    Desert Sand PT3101Desert Sand Black 4.5 kg10 lb PT3103Desert Sand Yellow 4.5 kg10 lb PT3105Desert Sand Red 4.5 kg10 lb