These are HUGE, which is great! I like that it's a 2 pack because my car is on it's last legs so whenever I have to get a new one, I'll have another sticker to put on it. I used it on my gas cap. I think these are great for that, especially if you're really forgetful or have difficulty seeing. I always wear my glasses but sometimes when I get out to pump my gas, I take them off (like always) and it's beneficial. I don't think these will be a good idea for white cars, it'd be invisible. But it looks really pretty on my gray one!