Hercules Ceramic Chronograph Movement: ISA 8171/201 chronograph mov't 3 jewels Case Material: Ceramic Strap Material: Ceramic Bracelet Crystal: Sapphire Crown: Screw Down w/ Function Pushers Clasp: Push Button Dual Deployant Strap Measurements: 8.5" L x 32mm W Case Measurements: 50mm Case Thickness: 18mm Water Resistance: 20 ATM - 200 meters - 660 feet