Case: 41mm Lug to lug: 48 mm Lug Width: 20 mm Case Material: 316L surgical grade stainless steel Case thickness: 12.00 mm Crown: 5.5 mm screw down crown Crystal: Sapphire glass with inner layer anti-reflective (AR) coating Water resistance: rating to 300 meters, 1000 feet or 30 ATM Movement: Swiss ETA 2824 automatic movement Frequency: 28,800 vibrations per hour Lume: Swiss Superluminova BGW9 Bezel insert: Ceramic with lumed markers, numbers and pip Bracelet: 316 L stainless solid link bracelet with deployant clasp Case back: Embossed design Watch markers: Applied fully lumed custom markers Warranty: Two-year warranty The simplicity and versatility of the black dial/bezel of the Volcanic Obsidian Black Ula Diver speaks to a classic, mature and sophisticated watch. The watch can be paired effortlessly with a night out on the town or a soul refreshing outdoor adventure. The black dial and bezel combination in combination with its subtle red highlights is consistently one of ZENEA’s most popular models of the Ula Diver. Complimentary leather quick release strap included with each watch.