This is a sinking disc that is 1/2" around. It is excellent for fresh or salt water fish. Contains 4 all natural color enhancing ingredients! Stays in the water over 24 hrs without disintergrating! MAIN INGREDIENTS: Krill Meal, Fish Meal, Algae Meal, Wheat Flour, Amino Acids, Spirulina Alfalfa, Soybean Meal, Fish Oil, Beta Carotene, Vitamin A Acetate, D-Activated Animal- Sterol (D3), Vitamin B12 Supplement, Riboflavin Supplement, Niacin, Folic Acid, Calcium Pantothenate, Pyridoxine Hydrochloride, Thiamine, Biotin. GUARANTEED ANALYSIS: Protein 33% Min., Fat 5% Min., Fiber 5% Max., Ash 9% Max., Moisture 10% Max.