The reverse of the mug can be personalised with a message over 4 lines up to 20 characters per line. All personalisation is case sensitive and will appear as entered. Due to the nature of this product and the font type used please refrain from using all capitals in your personalised message. If the message is all in capitals you will find the personalisation extremely difficult to understand and may even result in personalisation being missed off the product. Many thanks for your cooperation. What’s more this fantastic mug is available with next day delivery!Hand washing is recommended. Material is ceramic. Perfect for Weddings, Anniversary, Engagement, Congratulating Someone.