Quartz. Army camo strap and strap. Water resistant up to 20 ATM. 51.2 mm case. G-SHOCK — Are you tough enough? Developed to thrive in environments which test the very limits of human endurance, G-SHOCK supports you with every turn. DJs, hip-hop artists, skaters, snowboarders and trick biking professionals have known this for thirty years. Be tough. Do it anyway. Choose G-SHOCK.