Stainless Steel Case with a Helium Release Valve. Black Rubber strap and extra strap extension. Note: this is a big watch! Appox. 46mm (1 7/8") wide not including crown and a very hefty 18mm (5/8") thick. 6mm Non-Reflective Scratch-Resistant Mineral Crystal Ratcheted One-Way Rotating Elapsed-Time Bezel. 180-Day Power Reserve that Charges in Sunlight or Indoors. Screw-Down Crown Reinforced urethane rubber strap with extender strap included for dry suits and thick wet suits. Low Charge Indicator and Time Reset Advisory. Water-Resistant to 300 Meters (1,000 feet).