1.If you are a cab driver,these stickers are helped,passenger don't touch the handle once they see it. 2.Suitable for driving service business. 3.People loves to slam doors the sign helps,the wear and tear of your car door is greatly reduced. 4.4x2 Inch is a good size,Bright yellow color grabs your attention. 5.Great for rideshare/cab drivers with automatic doors,helps with letting riders know that driver will open the door for them.