Beaphar Cana Grit contains oyster shell, charcoal, fine selected gravel and minerals which birds need to maintain good digestion.
Oyster shell 82.1%, gravel 16.3%, charcoal 1.6%.
Beaphar Cana Grit can be given as you wish, but in moderation. The birds will naturally eat as much as they need.
Always keep fresh drinking water available.