Top Fin CN-S Corner Filter Cartridges are the perfect refill for the Top Fin CN10 Corner Filter. This 6-month supply of filter cartridges features activated carbon to help keep water clean and healthy. Features: With activated carbon to help remove heavy metals, odors, pigments and organic waste 6-month supply Includes: 6 Count Intended For: Refill for Top Fin CN10 Corner Filter Product Dimensions: 5.9 in L x 4.3 in W (14.9 x 10.9 cm)