LTWHOME Fish Pond Foam Filter Sponge Set Media (Pack of 1 Set) Each set have 3 foams ( 1 x fine, 1 x Medium, 1 x Course) Reticulated Foam Sheets Fits A Wide Range Of Filters Simply Cut Holes In The Desired Position With Scissors New Filter Sponge Will Help Improve Filtration 17 inch x 11 inch Pond Filter Foams