The F.M. Brown’s Sons, Inc. Avian Grit Premium Bird Gravel is a high-quality bird gravel that is perfect for keeping your birds healthy and happy. The gravel is made of a premium material that is designed to help with digestion and aid in the absorption of nutrients. The gravel is also easy on your hands and feet so you can avoid skin irritation. The F.M. Brown’s Sons, Inc. Avian Grit Premium Bird Gravel is available in a 20-ounce bottle.