Specifically designed as a replacement filter mat for the Aquascape signature Series micro falls biological waterfalls (# 99774). - measures 14.25" X 13.25" X 2" - includes one (1) filter mat Aquascape Filtration Mats are designed & contracted of high quality materials, providing effective filtration to help eliminate unwanted debris from your pond systems. Aquascape is passionate about fish ponds & water features, providing innovative & Proven products that stand above the competition.