This product is the Green Matala Filter Pad for the Medium Aquafalls. Green is the most coarse pad and used for large particulate removal. This Medium AquaFalls Pad is shaped like a trapezoid, measuring 23.5" long on one end, 20.5" long on the other and 30" wide. 3 pads per Aquafalls are required. You can mix Green, Blue and Gray for best filtration results, but have the water go through the coarsest pad first.