First things first, it comes in two sizes: medium and large. Both come in the same metal options: stainless steel, two-tone (steel and yellow gold), pink gold, and yellow gold. However, the large version is also available in a skeletonized version in either pink gold or stainless steel. All are powered by the automatic caliber 1847 MC, though the large version features a date display and the medium does not. All options come with either a matching Santos bracelet and a strap or two different straps. This is because Cartier has developed a new, easy way to change straps in a hurry, so you need a pair to really experience the innovation. Furthermore, they have incorporated SmartLinks that allow the wearer to easily change out links without a screw driver.