All Sand and Gravel pics are sized 1 to 1Natural White # 00710 (10 lb) # 00720 (20 lb)Desert Rose # 00711 (10 lb) # 00720 (20 lb) Aztec Gold # 00714 (10 lb) # 00724 (20 lb)Baja Tan # 00712 (10 lb) # 00722 (20 lb)Smokey Sands # 00713 (10 lb) # 00723 (20 lb)All Natural ReptiliteTM Calcium Carbonate Substrate From CaribSea100% Edible and Easily Digestible, ReptiliteTM is the Most Soluble Calcium Carbonate Available ReptiliteTM Allows Reptiles to Easily Ingest Necessary Calcium For Proper Bone Development* Reptilite's Unusual, Naturally Spherical Grains are Friendly to Scales and Carapaces* No Artificial Dyes or Chemicals, Reptilite is100% Natural* Reptilite is both Silica and Phosphate Free* Contains Strontium, Magnesium, and Potassium* Low Impact