Replacement Cartridge This is a replacement part specifically for the MIN BOX120 filter. Regular replacement helps maintain the filter's performance and ensures a clean water environment. Quantity: Sold as a set of 4. - Brand: KOTOBUKI - Product Name: Sponge Cartridge for MIN BOX120 - Quantity: Set of 4 - Application: Replacement Thank you for viewing. Please refrain from purchasing if you are concerned as this item has been stored at home.