Oracal 651 Permanent Outdoor rated Decal using your custom URL (Web site) Address to create a QR code. These allow your customers to quickly grab your information with a quick snapshot from their cellphones camera. This allows them to automatically go to your website to review your information provided there. Must be put on a contrasting solid color to work the best so use black if your putting it on a white truck or white if your putting it on a Black Van and so on. We can cut a square background of a contrasting color of vinyl if its needed-We pick the color of the background to ensure it will work correctly. Look for that option when completing order. Multiple sizes available - Min size required for these is 4"x4" We do not do smaller than this size. See our other listings at http://www.amazon.com/dp/B09QFVT7DJ or contact us thru messages for custom items that fall outside of our self service listings.