Hillman 3 in. Black & Silver Reflective Mylar Sticker Wide Style Letter K is designed to meet US Coast Guard and 911 requirements for boat registration posting with its three-inch size and reflective properties. This versatile sticker is for use on houses, mailboxes, mailbox posts, jet skis, and boats, providing clear and durable identification. Its black and silver reflective design ensures high visibility in various lighting conditions, making it a reliable choice for safety and compliance. Model Number: