Reflective Open Warning Stickers set includes four stickers designed for automotive use. They serve as simple yet effective warning signs for the vehicle, especially useful at night. They are installed so they are visible when the car doors are opened. The construction uses PVC material with a multilayer reflective surface. Each sticker measures 3.6 inches in length, making them easily visible even from a considerable distance. Light reflection occurs due to the microprismatic structure of the surface, which returns directed light. The adhesive backing is strong and durable.