SmartCat Lightweight Clumping Litter is 1/2 the weight of traditional clay litters. This litter creates a rock hard clump, that you have to see to believe. Not only is the clumping unbeatable, this litter is also lightweight. SmartCat's technology stops odours on contact, and is 99% dust free. Your cat will thank you for choosing SmartCat Litter. Features: No Tell, Can’t Smell-On Demand Odour Control Unbeatable Clumps.