With the 6-Pack SaniSolution Smart Cartridge, you always have a cartridge on hand and you save money on shipping and cartridges. Each Cartridge in the 6-Pack lasts for 60 washings. Each Cartridge is 4" x 7" x 1.5". 15 Fluid Ozs. 6-Pack Weighs 12 lbs. CAUTION: This green colored 60 wash Cartridge will ONLYwork in the original CatGenie 60 Model. The original CatGenie unit has blue colored buttons and the CatGenie 120 has orange colored buttons. Please note: The 120 Cartridge will NOT work in the CatGenie 60.