PROVIDES EXTRA SAFETY WHILE DRIVING EASY INSTALLATION Highly durable, ultra slim design High definition frameless glass mirror is waterproof, rust resistance and features anti-spatter design. Strong waterproof 3M adhesive tape is designed for long-term use. In the Box : Pack of 2 Blind Spot Mirror EASY INSTALLATION — It has easy installation; no tools required simply peel and stick on to the existing rear view mirror. Press down hard when the mirror is stick to the side mirror to prevent fall off from the side mirror. Note: these round mirrors are 360 degree adjustable.