These were great! I purchased these for a friends wedding. We are motorcyclists, so wanted to decorate their bikes instead of their vehicles. These clung to all surfaces securely, with no scratching or residue left behind. After the wedding they went on their bikes for a 4000 mile trip. Most of them did fly off, but one of the hearts made it all the way there! I would recommend these to anyone that wants to use decorations, that are safe and will not leave any marks at all. UPDATE: It has been over a year, and one of the heart stickers is still on my friends windshield, it has been on the bike for over 9,000 miles!