One each of the Gray-Super High Density, Blue-High Density, Green-Medium Density, and Black-Low Density filter mats. 4 Pack of Matala Mat Filter Pad 39" x 24" x 1.5" The open, highly aerobic tri-dimensional structure of Matala Filter Media promotes healthy water conditions and ease of cleaning in in a wide variety of filter designs. This is simply the most effective, longest lasting, crush resistant filter material available today! You'll see it featured in every major Pond, Koi & Fish Care Magazine. It is a vast improvement over the OEM filter mats standard with most filters/skimmers today & a fantastic upgrade for any brand filter or skimmer! Easily trims to fit Aquascape, Savio, American, Easy Pro, Laguna, Cyprio/Hozelock, etc. skimmers & filters just to name a few. Features: A choice of densities allow for step-wise transition from mechanical to biological filtration Excellent surface area per sq. ft. with good adhesion of nitrifying bacteria. A high number of interstitial spaces in the tri-dimensional matrix of the filter media improves an early and even growth of bacteria. High free volume for smooth, even water flow throughout. Very resistant to plugging & easy cleaning. Mats are self-supporting, form-stable, rigid and non-brittle. Easy to cut to fit with a Heavy duty Scissors, utility knife, circular saw or jig saw! Non-toxic to the environment. Light weight. Versatile and durable. Lasts for many years- 6+ (2-5 times longer than ANY other mat on the market!)

• The open, highly aerobic tri-dimensional structure of Matala Filter Media promotes healthy water conditions
• Ease of cleaning in in a wide variety of filter Designs
• Mats are self-supporting, form-stable, rigid and non-brittle
• This is simply the most effective, longest lasting, crush resistant filter material available today!