Hublot, BIG BANG, model: 441.NM.1170.RX, automatic mechanical movement satin polished titanium, with 6 H-shaped titanium screws 42mm, Lightweight titanium metal case Titanium metal is much lighter than steel, ceramic and precious metals. It has a pressure-free feel when worn. The satin polishing process combines wear resistance and metallic texture, and is less likely to cause scratches. 2. 42mm compact size This is a smaller dial version in the Unico chronograph series, which is friendly to slender wrists and can also be easily accommodated by formal sleeves. 3. Black and white contrasting sporty style The silver-titanium case, black ceramic bezel and black rubber strap, with red chronograph hands as the visual highlight, are understated and not flamboyant, suitable for all scenarios including commuting, sports and leisure.