This compact SMB (surface marker buoy) folds into a small package for easy stowing while diving, then deploys quickly once you reach the surface. Made of rugged 210D nylon with HF welded seams, the bottom is sealed and a metal inflator and 42mm exhaust valve are included. There’s a stainless D-ring and bungee loop on the lower end, with a plastic D-ring on top for a flashlight.