Shiner , when we were short of work , we changed all our paper work to business card size eg. our windows have been cleaned ticket was just an " your windows have been cleaned on --/--/-- and on the back was our business card, Our quotation sheet was a full page with 3 detachable business cards at the bottom ,our invoices the same. It garnered us a lot of phone calls . for some reason people prefer the business card size and are more likely to keep it or pass it on