[Audemars Piguet Watches] Self-winding chronograph movement Black titanium alloy impregnable case with anti-magnetic protection Tapered buttons, hollow button protective bolts, crown and joints connecting the strap are all made of black titanium alloy 42mm meter diameter Hollow ceramic bezel Black matte dial features Audemars Piguet's exclusive M ga Tapisserie oversized plaid trim Jianghu people are called war survivors or hairy crabs