BRITA MAXTRA + Universal Filter Cartridge, 5 pieces, compatible with various water purifiers. - Model Name: MAXTRA + - Type: Universal Filter Cartridge - Quantity: 5 pieces - Usage: Water purifier filter - Compatible models: Various water purifiers I bought a box of these at Costco several years ago, but I'm selling them because I no longer use a Brita. Please understand that these have been stored at home. Thank you for looking.