Duvo+ shellsand is free from bacteria and germs. This dustfree floor covering for cages and aviaries ensures a hygienic and fresh habitat for your birds, which will help them to stay healthy. It contains shells to help your bird to grind up its seeds and grains and to aid digestion. The added oyster shell grit is a source of minerals and calcium and contributes to healthy growth, good feather structure and optimal bone condition. The aniseed scent helps keep the aviary smelling fresh. Refresh regularly..