Cartier, Ballon Bleu series, model: WSBB0025, the synthetic spinel (blue cachycarpe) at the crown and the protective cover are the soul elements of the Ballon Bleu and also the most recognizable design. The deep sunray blue dial is paired with Roman numeral hour markers and sword-shaped blue steel hands. There is a date window at the 3 o 'clock position. The overall look is elegant and grand. The stainless steel case is 13 millimeters thick, paired with a blue alligator leather strap and a stainless steel folding clasp, making it suitable for both business and casual Settings. Automatic mechanical, stainless steel, dial diameter: 42mm.