Versele-Laga Colombine Ideal bloc TrayPicking stone 6 x 550 g Colombine Ideal Bloc is a picking stone on a clay basis with minerals and trace elements for pigeons. Easy to use: one stone with minerals and trace elements Ideal for breeders, youngsters and racing pigeons COMPOSITION calcareous marine shells, kaolinitic clay (22%), redstone, flint grit, ground oyster shells, turmeric (2%), salt, millet, brewers yeast ANALYTICAL CONSTITUENTS crude ash 90% (47% ash insoluble in HCl), calcium