Ultra Pet Tracksless Litter Pearls, 3.5-Pound Bags (Pack of 2) Tracksless Litter Pearls have a surface area with 1000s of mini-channels for liquid absorption 70 percent less landfill contribution than clay litters Irregular shaped for low tracking 99.9 percent dust free Available in 3.5 (1 month), 7.0 (2 month), 10.5 (3 month), and 20lb. (6 month) bags