Brand: kassaw model: k826 machine: automatic machine movement mirror: high hardness mineral glass mirror strap: 316L fine steel buckle: Butterfly double snap buckle.Case diameter 40mm watch weight 144g case thickness 13mm chain length 19cm chain width 19cm,Fully automatic mechanical synthetic sapphire mirror 50m deep waterproof selected fine steel material.The original full-automatic mechanical movement of CaSO has strong core quality. It uses the rotary pendulum in the wearing process of the pendulum to drive the spring to generate energy, so as to promote the travel time, complex process and design appearance, so that the movement has high appreciation value