This is a plastic watch for him. The watchcase is made out of plastic. The strap is made out of silicon rubber. The back cover is made out of stainless steel. The watch is waterproof till 100 Mtr. (10 ATM) The Diameter of the watchcase is 48mm and thickness 11mm. The watch has a quartz (battery) movement made in Japan (by the Seiko company) The watch is new. You will recieve 2 years international guarantee on it.