Hublot Big Bang series, model: 421.NM.1170.RX, automatic winding titanium, case diameter: 44MM Focusing on the "sporty luxury" style, the combination of titanium and ceramic strikes a balance between lightweight and durability, making it one of the benchmarks of Hublot's modern sports watches. Case: 44mm satin-polished titanium metal, paired with a black ceramic bezel. The signature 6 H-shaped titanium screws are highly recognizable. The titanium material is lightweight and anti-allergic, while the ceramic bezel is wear-resistant and scratch-resistant. Dial: Fully skeletonized mechanical dial, featuring large Arabic numeral hour markers and luminous hands. At 3 o 'clock on the right, there is a date + 30-minute chronograph sub-dial, and at 9 o 'clock on the left, there is a 12-hour chronograph sub-dial. The overall layout is clear yet full of mechanical feel. The strap: A black structured rubber strap with a titanium folding clasp, comfortable and durable to wear, is a classic configuration of Hublot sports watches.