Aspen Pet Booda Clean Step Litter Box (Pearl) Keeps odors from getting trapped in the seams and corners. 99% odor-free and 50% bigger than average litter box. The activated charcoal filter provides outstanding odor control. Size: 21 1/2" dia x 19 1/2" high. Ramp is 9" wide, the litter pan is a full 6" deep.