Aids In Grinding Feed 100% Crushed Washed Granite Sourced In The Usa Recommended From Hatch To 6-8 Weeks Of Age 100% Satisfaction Guarantee Even The Youngest Birds Need Some Grit To Keep Their Gizzards Working Properly. We'Ve Got The Perfect Size Just For The Babies, From Hatch To About 6-8 Weeks Of Age. Sizes Can Be Mixed With No Worry - The Birds Will Choose The Right Sizes For Themselves. 100% Crushed Washed Granite 10Lb. Bag Store In A Dry Place