Hillman 3 in. Black & Silver Reflective Mylar Sticker Wide Style Letter A is designed to meet US Coast Guard and 911 requirements for boat registration posting, making it an i choice for safety and compliance. These reflective letters, measuring three inches and larger, are for use on houses, mailboxes, mailbox posts, jet skis, and boats. The black and silver wide style design ensures high visibility and durability, combining functionality with a sleek appearance for various outdoor applications. This sticker a reliable and easy way to display important information clearly and effectively.