Aqueon (2 Pack) Minibow Replacement Filter Cartridge Size Small (6 Cartridges Per Pack / 12 Total) Provide even distribution of carbon throughout; 25 percent more activated carbon Ready-to-use; Install in seconds PLEASE NOTE: This package includes (2) bags of (6) filter cartridges Fits Mini Bow 1, Mini Bow 2.5 and Mini Bow 5 Replacement Filter Cartridge For Aqueon Mini Bow Aquariums