Cartier created the W2BB0012 from the Ballon Bleu collection to illustrate the whimsical wonder of a hot air balloon in timepiece form. The W2BB0012 has a round-shaped stainless-steel case that is 36MM in diameter and 12.05 thick with a scratch-resistant sapphire crystal and cabochon shaped crown with a fixed stainless steel bezel. It has an opaline silver dial with blue steel hands and Roman numerals hour markers. The W2BB0012 is powered by the caliber 049 which has a power reserve of 42 hours. The case is paired with a two-tone stainless steel bracelet with a stainless steel fold-over clasp. It has a water resistance of 30 meters (100 feet).