The practical case of the AVI-8 Flyboy Engineer Automatic AV-4075-33 is made of stainless steel. The case's 42mm diameter ensures that it will comfortably fit most wrists. The domed, scratch-resistant sapphire crystal adds to the watch's toughness and qualifies it for daily use. For outstanding legibility, the black dial (and color-matched date window) contrasts wonderfully with the bright, sword-shaped hands. A comfortable stainless steel bracelet is included with this timepiece.