Fluval Foam pads capture large particles and debris for effective mechanical filtration, the crucial first stage in the filtration process, Custom fit to prevent bypass, they have a pore size that allows efficient water flow with less clogging for long-lasting filtration, Fluval Foam Pads Features and Benefits:, - For freshwater, marine or reptile environments, - Effective mechanical filtration, 1, 5"" length x 2, 7"" width x 11"" height* SKU: RCHG0558