The Steel Z catches the light in a yet unprecedented way, while rose-gold touches illuminate the dial from within. And lightplay does not stop here: The original LED backlighting has 5 LEDs, for ultimate night-vision. The soft and sandy calfskin leather strap offers a welcome contrast in both look and feel. Case Diameter: 45mmCase Material: Stainless SteelSTEELZQuartz Inhouse MovementMineral Glass30m Water ResistantStainless Steel CaseLeather Strap