Sustainably Yours Cat Litter Small-Grain Formula is a smart litter choice for your family and the planet. This high-performing, environmentally friendly litter is made exclusively from corn and cassava. The plant-based, sustainable formula is naturally rich in starches—so it creates dry, fast-forming, firm clumps that will stay together during scooping and litter box clean ups. Plus, the small grains help with faster clumping. The unique formula instantly traps urine odor and prevents odor build up, all without added fragrance or irritating artificial scents.