Open your heart to even more possibilities of cuteness with the Heart Shape Pet Tag Red Aluminum worn by your cuddly pet. These custom engraved pet tags are made of durable, lightweight aluminum. Sturdy fastener attaches easily to collar. Specify up to 4 lines, limit 22 characters & spaces per line. Approximately 1 1/4" x 1 3/8". In order to produce a better product for our customers, this product is now limited to 4 lines of personalization.