Mine is bold writing and logo with Windows cleaned and contact details on the front of a card postcard size .
Then details about how to sign up & benefit and security of GoCardless to get more custys signed up , Sucess hasn't been great so will rethink on next batch from printers .
I won't put my bank details on any paperwork other than commercial invoices if needed and I certainly wouldn't put it all over the Internet .
Massive hacks and scams with people trying to obtain bank details yet you guys are giving that info freely for all the world to see