These vinyl letters are great for all clean and smooth surfaces where you want permanent lettering: mailboxes, windows, boats campers, vehicles, posters, signs, lockers, wagons, bumpers and much more at home, school and the office. Made in USA. WARNING: This product can expose you to Lead, a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov.