Luminox Men's 4221 ANU 4200 Series Analog Display Analog Quartz Black Watch Crystal / Glass material: Sapphire glass anti reflective coating Case material: Stainless Steel black brushed, Case Bezel: Rotating 1-Way Diver, Case Back: Screwed, Crown: Security Screw-On Analog-quartz Movement Case Diameter: 45mm Water Resistant to 660 Feet