The Fluval Edge Pre-Filter Sponge is exclusive for the Fluval Edge Power filter, This pre-filter sponge easily connects to the filter intake so that your small or baby inhabitants are protected from being drawn into the filter, The Fluval Edge Pre-Filter Sponge Features and Benefits:, - Connects to filter intake, - Traps fine debris, - Protects small or baby inhabitants from being drawn into filter, 1, 7"" length x 1, 7"" width x 4, 5"" height SKU: RCHG0438