This set consists of 1 watch, 1 Premium leather NATO strap and 1 nylon NATO strap. The case (40 mm) is Stainless Steel. This watch comes with an extraordinary premium quality calfs leather NATO style strap. Additionally, a NATO nylon strap is also included. OXYGEN PARIS Inspired by the sports fashion trend, Oxygen's new signature Exchange collection was launched in July 2011 in France and is now available in more than 20 countries. The trendy watch brand with interchangeable NATO straps is following the emerging trend of personalisation and interchangeability. The "Sport" and "Diver" models come in a gift box with 1 interchangeable nylon strap, like those used by NATO soldiers. These straps can be easily switched in a matter of seconds, no tools required. The straps are very strong, dry instantly and allow you to match your watch to your outfits and your activities. Also sold separately, Exchange straps come in a wide range of plain and striped colours. The entire collection is made of Stainless Steel cases and is waterproof to 100M/10ATM. Case finishing : Stainless - Steel - screwed back Glass : Mineral Movement : Quartz - 3 Watch hands - Dual Time - Day & Date Strap : Premium leather NATO strap + 1 Interchangeable Nato Nylon 20 mm Water resistance : 100 M Width : 40 mm