Reptile Sciences Black Terrarium Sand 10LBS (Grain size: 0.1 -0.5mm)Recommended Uses: Terrariums, Snakes, Reptiles, Turtles, Bearded Dragons, BOAs, Rat Snakes, Iguanas, Green Iguanas, Blue Iguanas, Tortoises & Lizards Directions: Add to terrarium or environment at approximately 2-3 Inch deep. Remove clumped waste material on a daily basis for optimum maintenance. Replace sand every 4 to 6 months to prevent toxicity.