All Sand and Gravel pics are sized 1 to 1 Natural 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 CaribSea 100% 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