The watch band is made of resin, waterproof, sweat resistant, soft and comfortable. Applicable model: Compatible with Casio GBD-100SM GBD-100 gbd-100 watch band. Bandwidth: See detailed picture for specific dimensions. What you get: a wristband, two tools. After receiving the strap, please do not rush to install, first compare with your original strap and dial, determine the appropriate, and then install. If you have any questions, please feel free to leave a message to customer service, customer service will reply to you within 24 hours.