Hillman 3 In. Black & Silver Mylar - Wide Style - Reflective - W features reflective letters that are three inches and over, designed to meet US Coast Guard and 911 requirements for boat registration posting. These versatile letters can be used on houses, mailboxes, mailbox posts, jet skis, and boats, making them a practical choice for clear and compliant identification. Their black and silver mylar wide style ensures high visibility and durability in various outdoor settings. Model Number: