Case: Patented three-piece case developed for specifically for the Deepsea watch. Rolex Ringlock System - featuring a nearly indestructible nitrogen-alloyed stainless steel support ring set inside the case, making the watch able to withstand pressure that would crush a submarine!. A 5mm thick domed sapphire crystal. Helium escape valve located at the 9 o'clock position of the case edge. Crown: Polished stainless steel patented Triplock'locking crown, ensured that the crown screws down as securely as a submarine hatch. Bezel: Uni-directional rotating bezel. Polished stainless steel rimmed with a ribbed edge for a sure grip. Black "Cerachrom" bezel insert, made of highly durable ceramic that is extremely hard, is highly scratch-resistant, has excellent corrosion resistant properties & is unaffected by ultraviolet rays so the color will not fade. Matte platinum coated numbers & graduation indexes. Luminous dot. Dial features: Black dial. Date window displayed at the 3 o'clock position. Applied polished rimmed hour markers & hands with luminous fill. Bracelet & buckle features: Brushed stainless steel bracelet with polished edges. Oysterlock double-locking deployant clasp Fitted with the patented Glidelock Extension System, enabling adjustments in 2mm increments for a total of 20mm without the need of a tool. Additional Fliplock extension links allows the bracelet to be extended by an additional 26mm to fit over a diving suit. Rolex in-house Caliber 3235, beats at 28,800 vph, contains 31 Jewels & has an approximate power reserve of 70 hours.