The following is a template to use for the back of a 4 1/4" x 6" postcard. This is the maximun size for the $0.24 1st class postcard rate. By following these specifications, you can qualify for maximun "Automation" postal discounts.

For larger size postcards the following specifications should be used:

• Its legnth does not exceed 11 1/2"
• Its height does not exceed 6 1/8"
• Its thickness does not exceed 1/4"
• Its aspect ratio (length/height) does not between 1:1.3 and 1:2.5 inclusively.