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Versele Laga Prestige Grit with Coral is a tried & tested mixture of oyster shells, grinding stones, seashells, redstone & charcoal. All of which are an essential food supplement for caged birds as it provides minerals & trace elements as well as acting as the teeth of a bird in their crop.. Analytical constituents. Crude ash 98.5%, Calcium 23%, Phosphorus 0.02% & Sodium 0.15%