Case Thickness: An ultra-slim 6 mmCase Diameter: Available in multiple sizes, most commonly 36 mm or 40 mmWater Resistance: 30 M / 3 ATM (withstands splashes or light rain, but not suitable for swimming)Material: Hardened mineral crystal glass with a polished stainless steel backStrap Width: 18 mm (for 36 mm cases) and 20 mm (for 40 mm cases)Strap Options: Interchangeable genuine leather or woven nylon NATO straps