Premium White Clay and Crystals Blend for powerful odor control! All Tidy Cats products are designed to handle the needs of multiple cat households. And Tidy Cats Crystals Blend is no exception, with an optimal blend of premium white clay and crystals for powerful odor control. Odor Controlling Power: Lasts longer than clay alone. Tidy Cats Crystals Technology: Dehydrates odor causing moisture. Highly Effective: Dust control system eliminates 99% of airborne dust. Made in U.S.A.