One size 27mm diameter Below is the suggested information to put on the tag. Line one: Pets name Line two: area code Line three: phone number The engraving would appear like this on the tag; Buddy 204 123-4567 **Note: More info per line = smaller text on the finished tag** (If you choose to have extra characters in Line two and Line three, the engraving may not be as clear) **We are currently only able to engrave English & French characters**