Cut To Fit Poly Fiber Plus Thick. Penn Plax Cut To Fit Poly Fiber Plus is a 18 in. x 10in is a pad that you can cut to fit in any filter. With it thick dense material it help strap coarse or fine debris particles. For Crystal clear water, while helping to improve water quality. The thick and dense material of this Polyfiber Plus filter media pad allows it to trap coarse and fine debris from your tank. The product is 10” x 18”. The filters media pad is made for freshwater and marine aquariums as well as ponds. It’s made for all filter types.