Cartier Santos Skeleton Series Launches SF to Create the Ultimate 1:1 Replica. Parameters Sync with Authentic 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; Sapphire Crystal; Hands: Blue Burnished Steel Hands; Black Version with Luminous Imported Green Glow; Crown: Gem-Set Crown, produced by ZY.