The Rolex Sea-Dweller 4000 is the culmination of decades of expert Rolex design. Resistant up to 4,000 feet, the Sea Dweller is the ultimate divers watch. Designed to withstand the harsh conditions of deep saturation dives, the 43mm Oyster case utilizes 904L stainless steel, a screw-down case back, a ceramic Cerachrom unidirectional bezel, a helium escape valve, and a scratch-resistant sapphire crystal. The case is slightly thicker to accommodate the increased water resistance, creating a bold statement piece. The bezel is accompanied by a matching black maxi dial with larger luminous hour markers and sweeping hands, creating a highly visible reading wherever your adventures take you. A brushed steel Oyster bracelet is built with flat, three-piece links and a folding safety Oysterlock clasp with a tool-free Glidelock extension system for the perfect fit over a wetsuit or under the cuff of a dress shirt.