3" -or- 4" 5" Font heights available on this listing - Most Boat Registrations restrict Text size to a minimum of 3" height -Please review your states recommendations/Rules. If this listing does not fit size requirement please message us to discuss custom orders. Please select the Text Height & complete the maximum length of the entire registration # your requesting. It tells us the space you need the text phrase to fit on. We will professionally fit your text to the max space you pick. We dont enlarge to this max size just make sure it will not be to long for the space. For Boat registrations you will get a quantity of 2 when you order one. The main items we need to have to process an order are the following - 1) Your Custom Boat Registration # (up to 12 Characters each #) Spaces and punctuation counts as a Character count them when you count 12 Characters. 2) Color of Vinyl Requested 3) Custom Size Required Height x Width (If different from price categories in dropdown selection) 4) Font Name Or number requested. Must Be a Block type Bold font for Boat registrations