Ethical Products presents Dr. Bales One Source cat litter, which is made from a single ingredient: yuca root. The litter is made from the cooked bark and byproduct of the yuca root after processing for human-grade foods. This safe, cooked, renewable and sustainable plant is high in starch and fiber content, making it a great natural source for cat litter for its high absorbency and powerful clumping characteristics, the company states. The lightweight litter is soft on cats’ paws. It is available in three sizes: 4.4-lb., 8.8-lb. and 17.6-lb. bags.