Radio World Time Date Bluetooth Gshock Solar Watch Full Set NEW Based on the traditional Japanese color "kurogane," the titanium exterior is hardened and coated with green DLC to recreate the deep blue-green color that emerges when heated iron, the material used for armor. The bezel is made of recrystallized titanium, which features a unique crystalline pattern reminiscent of the "nimon" (boiled crest) found on the blade of a Japanese sword. The titanium case and bezel are coated with green DLC. The band is made of soft, durable fluororesin and features the Bishamon tortoiseshell pattern found on the armor of Bishamonten, the ancient god of strength. The indexes, utilizing Yamagata Casio's fine processing technology, feature beautiful edges and curves reminiscent of the curves of a sword. The watch is also practical in terms of functionality, with radio wave reception and Bluetooth connectivity for smartphones. Furthermore, attention to strength and quality is evident in every detail, including Zaratsu polishing, double-hardening treatment, and anti-reflective sapphire crystal.