Hillman 3 in. Black & Silver Reflective Mylar Sticker Wide Style Hyphen (-) high visibility and durability, making it for a variety of outdoor applications. These reflective letters, measuring three inches and over, comply with US Coast Guard and 911 requirements for boat registration posting. They are versatile and can be used on houses, mailboxes, mailbox posts, jet skis, and boats, ensuring your markings are clear and easy to see. This sticker combines functionality with a sleek black and silver design, enhancing both safety and style.