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Versele Laga Colombine Grit & Redstone is made up of washed and sterilized grit and red stone. The mixture contains gastric grinding stones, silex-stones, oyster shells, sea shells, red stone and charcoal. Also contains aniseed. Ensures an optimal digestion and produces solid droppings. ContainsSilex stones, gastric grinding stones, sea shells, oyster shells, charcoal and redstoneHow To UseTo be served in a separate tray and ideally refreshed daily.