Under the hood you will find an automatic, Japanese SII NH35 movement. The glass is 4.5mm thick scratch resistant sapphire glass. The impressive 1000 meter water resistance of this watch is possible due to the helium valve, that you can see on the side of the case. The uni-directional 120 clicks bezel has a ceramic insert (which is very scratch resistant). All these qualities ensure to the Sharkmaster is able to handle nearly any situation. 

The difference between the SMS1081 and this SMS1081B can be found in the dial. The new SMS1081B has a shiny black dial, whereas the dial on the SMS1081 is matt black.