Sandpaper is a practical alternative to bird sand. A sheet of sandpaper is simply placed on the cage floor and renewed regularly to keep the cage floor always clean and hygienic. The sandpaper also contains valuable minerals, calcium and ground shell limestone. These ingredients increase the well-being of the birds and promote digestion. Picking grains of sand and walking on the sandpaper keeps beak and claws in their natural shape. Ideal for canaries, parakeets and all other cage birds.