Genuine Casio Replacement Watch Strap/Band to fit Casio G-8900, GA-100, GA-100C, GA-120, GA-300C, GAC-100 | 10347688. Get the perfect replacement fit for your Casio watch. This genuine factory Casio watch strap/band is made using the same high-quality materials by Casio with their watches and are easy to install onto your Casio watch to ensure a perfect, secure, and comfortable fit.