Hillman 3 in. Black & Silver Reflective Mylar Sticker Wide Style Letter I is designed to meet US Coast Guard and 911 requirements for boat registration posting with its reflective letters that are three inches and over. This versatile sticker can be used on houses, mailboxes, mailbox posts, jet skis, and boats, providing clear and durable identification. Its black and silver reflective design ensures visibility and compliance for various applications. Model Number: