This 16 mm wide Hadley Roma diver collection watch strap is made of genuine red silicone. This beautiful 100% waterproof band flares to 21 mm on the buckle end. It measures 2.5 mm thick. This watch band fits Casio G-Shock watches. Length dimensions below do not include the buckle. Add the length of your watch to ensure that this strap would fit your wrist. Image for illustration purposes. This strap does not come with spring bars.