OBAO Automatic mechanical movement .*Case with high quality finishing.*Water resistant: 30m*2.5D Arc Hardlex Crysthas mirror.*Pull Out crown.*Case Material: 316L Stainless steel.*Case diameter: 42.00mm.*Case thickness: 12.00mm.* Bracelet width: 20.00mm*Bracelet Material: Leather/ Stainless steel .This product is divided into quartz movement and automatic mechanical movement. Please pay attention when purchasing.(A. B .C is automatic mechanical movement)