This mirror is designed to be worn on the arm and does not need to be mounted on a bike. High-quality and weather-resistant construction. Features a lightweight and compact design with 360-degree rotation, allowing easy viewing without turning your head while riding, enhancing safety during outdoor cycling. Wide-view convex mirror provides an expanded field of vision. The mirror angle can be freely adjusted to monitor traffic behind. Convex mirror with a 36mm diameter offers a clear and accurate reflection. Secure clasp mechanism for easy opening and tight closure. Color: Black Material: Plastic Fit: One size fits most adults Item Dimensions: 63 x 51mm (2.5 x 2.0 inches) Mirror Diameter: 36mm (1.4 inches) Package Dimensions: 108 x 70 x 35mm (4.2 x 2.8 x 1.4 inches) Package Weight: 37.1g (1.3 ounces) Wristband made of breathable, elastic fabric for comfort and secure fit. Suitable for both men and women. Packaging List: 1 x Arm Mirror