33mm stainless steel and 18K yellow gold case, 9.96mm thick, 18K yellow gold fluted crown with a synthetic spinel cabochon, sapphire crystal, silvered opaline and guilloché dial with blued steel sword-shaped hands, caliber Cartier 076 automatic movement, 18K yellow gold and steel bracelet. Water resistant to 30 meters.

https://www.swissluxury.com/cartier-watches-ballon-bleu-33mm-steel-and-yellow-gold.htm