Please specify the sizes of each item since size standards vary in different regions (North American business cards aren't the same size, as are letterhead). What is the diameter of the round sticker?

Business card: 3.5 x 2 inches (8.89 x 5.08 cm)

Sorry, I forgot to ask if the business card is double sided.

And also, for this much spec work, normally the project is guaranteed, so I'll wait until then.

The business cards are double sided.

I forgot to set this as guaranteed.  I''ll update that now.  Thanks!