ARM & HAMMER™ HardBall™ Clumping Litter is a lightweight cat litter with virtually indestructible clumps. The innovative formula works to quickly shrink cat waste and odours into ultra compact clumps for easy, no-mess scooping. This lightweight perfected formula is nearly 60% lighter than our regular clay litter, yet is highly absorbent. Scoop it. Don’t change it.