QuadGuard crash attenuator systems consist of a number of bays arranged to suit available space and application. Each QuadGuard bay consists of an energy-absorbing cartridge, Quad-Beam fender panels, and critically, a diaphragm. This listing is for the QuadGuard diaphragm; other components sold separately. Diaphragm is silver and measures 24” x 24”. Size of diaphragm determines width of system; check and compare against other barrier system components. Contact 95TSS with additional inquiries and browse the site for more genuine QuadGuard parts, crash barrier systems, and other safety equipment.