The Submariner is Rolex's iconic dive watch. It features a blue dial and blue bezel insert made from Cerachrom, a ceramic material that is scratch-resistant and highly durable. The watch is powered by the self-winding Caliber 3235 movement, which has a power reserve of approximately 70 hours. The yellow gold and stainless steel case measures 41mm in diameter and is fitted with a yellow gold and stainless steel Oyster bracelet with a folding Oysterlock safety clasp. The Submariner is water-resistant to 300 meters (1,000 feet).