Features - 100% pine litter is completely natural and silica-free.- Virtually dust-free litter won't create those "puffs" of dust when you pour or when your cat walks around her litter box. - Safe for all cats, kittens, and even other mammals—such as ferrets, guinea pigs or rabbits. - Biodegradable litter isn't just better for your home, but better for the planet, too! - Odor-control formula reduces the amount of stink in your litter box, making for a happier home. - 100% Ponderosa Pine.