Naturally Fresh Quick-Clumping Litter is an eco-friendly, clumping litter made from all-natural walnut shells. Walnut shells have the unique ability to control ammonia odors, meaning Naturally Fresh neutralizes odors organically without relying on harsh perfumes. Naturally Fresh is sustainable, non-toxic, and free of harmful silica dust. All Natural & Biodegradable Virtually Dust-Free and Low Tracking Proven Superior Ammonia Odor Control Homegrown in the USA Clay Free, Corn Free, Grain Free For Households with One or Two Cats.