Cape Topaz is compatible with 18 mm straps</br>Features 11 Stones and a Stone Weight of 0.05 ct</br>Quartz Movement</br>Case Diameter: 40mm</br>Water resistant to 50m (165ft: in general, suitable for short periods of recreational swimming, but not diving or snorkeling</br><br/>http://www.amazon.com/gp/product/B01M7NFXM3