MannaPro® Poultry Grit is an effective product for all classes of poultry helping with proper digestion. Designed to be fed with coarse grains. Made of insoluble crushed granite. 5 lb. bag. No preservatives or artificial ingredients. Feeding directions: Feed grit in a separate feeder, or add 1 lb. to 40 lbs. of feed. Provide to poultry fed Scratch or other coarse grains beginning at 8 weeks of age.