Scubapro Marker BuoysThese new professional grade surface marker buoys feature a double inflation system with an open bottom and duck beak valve as well as a metal inflator. The buoy is constructed of durable 210D nylon with HF welded seams. Theres a stainless D ring and bungee loop on the lower end, with a plastic D ring on top for a flashlight. Available in different sizes and colours. High quality smb Double inflation system Open bottom duck beak valve and metal