Cartier, model: WSBB0030, Ballon Bleu series, with a diameter of 33mm. The most recognizable element of the Ballon Bleu is the synthetic spinel protective cover at the crown, and the overall round case shape is thus named. This watch features a silver-white sunray dial, with Roman numeral hour markers and sword-shaped blue steel hands. There is no date window at 3 o 'clock. The overall style is simple and elegant, and it is paired with a black alligator leather strap, making it a very classic match for formal women's watches. The case is made of stainless steel, and the crystal is made of scratch-resistant sapphire crystal glass, which is highly durable for daily wear. Automatic machinery.