A lightweight cat litter with virtually indestructible clumps? Introducing ARM & HAMMER™ HardBall™ Clumping Litter. The innovative formula works to quickly shrink cat waste and odors into ultra compact clumps for easy, no-mess scooping. Our Lightweight Perfected Formula is made with highly absorbent sorghum grain and is nearly 60% lighter than our regular clay litter. Scoop it. Don’t change it. Freshness guaranteed up to 20 days. Purrfect for multiple cat homes!