I could not tell you why square sized business cards weren't listed on the website. We've been printing them for ages, but they just... weren't. Growing pains, y'all! Sometimes I am forgetful :)
The good news is, they are now listed in two different sizes and finishes. These make perfect business cards, but we've also seen them used as jewelry backing cards or enamel pin cards too.
Ain't nothin' wrong with being square!