SJ Production Cartier Santos Skeleton Series Nk1 First Release SF Creates the Strongest 1:1 Replica. Parameters Synchronized with the Genuine Product: Case Diameter 39.8mm, Movement Swiss Ronda 4S20 Modified Quartz Movement, Case Thickness 9.08mm, Dial Color Skeleton, Dial Shape Square, SKU: Black, Silver with Silver Ring, Silver with Rose Gold Ring, Silver with Gold Ring. Strap Colors: Black, Blue, Brown, Green, Made of Imported Calfskin. Buckle Type: Double Folding Clasp. Transparent Case Back: Yes. Mirror: Sapphire Crystal. Hands: Blue Burnished Steel Hands. The Black Version Features Imported Green Luminous Material. Crown: Gem-Set Crown. Highly Recommended Men's Quartz Watch by Sanjie. SJ Delicately Creates Ultra-Realistic Product Photos for You.