Myezfit Car Safety Reflective Tape Door Open Warning Stickers Reflector Mark Decal - 4PCS White. The reflective "OPEN" signs have the same properties as a street sign when light shines onto it, reminds the driver of nearby car. Reduce the probability of accidental collisions at night, rain and fog. Reduce rear-end collisions and side collisions. Fine workmanship, sticking firmly, waterproof, not hurting the paint, not easy to fall off. Easy to install. Can be used on car, door, front and rear bumper, nocturnal backpack, running clothes, a good choice for day & night walking. Quantity:4PCS White(Silver). Friendly Tips: The size is measured by hands, please allow minor error of measurement. Photo color might be a little different from the actual product due to color display of different monitors.