Kit is designed to fit into Elite size Porter case to help customize interior to fit needs. It consists of four layers of gray medium density foam 1.25-inch thick cut to fit bottom of case with sheet of convoluted gray foam for lid. Generic kit for most any application. Simply lay what you want to protect on foam layers, use marking pen for an outline and then with an electric carving knife, craft knife or scissors, cut out the shapes. Just be sure to leave enough material in remaining walls of foam to be protective of all items as bounce around. Minimum 1-inch wide walls are recommended.