This depends on what you are using the custom hang tag for and how much information you want to display on your hang tag. Hang tags are small in nature and there isn't too much variation from one size to another. You want to make sure that the hang tag is big enough to display all the information or images. For a frame of reference, the 'turtle tees' hang tag above is 1.75' x 3.5'. The standard credit card is 3.370' x 2.125'. In comparison, the 'turtle tees' hang tag is slightly longer in terms of width and slightly shorter in terms of height.