Worlds Best Extra Strength 17# Only litter made from whole-kernel corn. Made with all-natural ingredients&mdash;with no added chemicals&mdash;it's totally safe for cats and the whole family, no toxins in case it is ingested.&nbsp; No silica dust for you or your cat to breathe. Ends odor the best, corn has a naturally microporous structure that traps nasty ammonia odor in every clump. Clumps fast, clumps moisture on contact &ndash; with no seeping, sinking to the bottom or sticking to the sides of the box.