... ,beautiful,light,sound abatement,abrasion resisrance. Material: stainless steel perforated metal sheet, Carbon steel, Galvanized plate, Aluminum sheet, Brass, Copper, Plywood, Fiberboard, Rubber board ... , Pasteboard, Al-Mg. alloy plate, Nickel-plate, Fiber Glass, PVC plate, Composites. Hole shape: Round, Square, Slot, Triangle, Long round, Scale, Diamond, Oval, Hexangular, etc ...