最近弄到手的是Tran Tixxii is twice as hard as pure titanium,
MRG的小方塊更硬 These breakthrough timepieces are a study in metal craftsmanship. The case and bezel are made of Ti64-based super-hard titanium alloy, while the band is made of another special titanium alloy, DAT55G, that is both three times harder than pure titanium and highly workable. The bezel top is crafted in COBARION®, a cobalt-chrome alloy four times harder than pure titanium.