This tag can be brass or aluminum, 25mm or 30mm. For 25mm, the maximum amount of letters across is 6 and for the 30mm the maximum amount of letters across is 8. The letters stand out more on aluminum because it is a softer material. It features the "deco" font which is 6mm. You can choose from many different design options, or you can go simple with no design. If you have any questions, feel free to ask.