The product is a genuine Casio G-Shock watch band bezel shell made of black rubber, designed for the GA-100 and GA-100-1A4 models. It is a high-quality replacement part manufactured in Japan, ensuring a perfect fit and durable construction for your Casio G-Shock watch. This unit is a single piece and is compatible with Casio G-Shock watches, providing a sleek and functional upgrade for your timepiece.