All of the Acrobat templates are meant to be printed on Avery cards except for the letter sized templates. The business cards are meant to be printed on Avery business cards. The four to a page postcard templates are meant to be printed on Avery postcards. The two to a page posters and the invitationlist postcards are meant to be printed on Avery note cards. When printing double sized cards you need to be sure the product is intended for double sided printing. Otherwise the card may come apart inside the printer and cause a printer jam or damage the printer. The following Avery product numbers are meant to be used with double sided printing. These are the Avery card products that have "microperforated" or "Ultra-fine perforations" in the product description. If a template has only one side then it can be printed on any Avery or other brand of card product that will work with your printer. Office Depot is a good place to get small quantities of cards and www.officequarters.com is a good place to buy large quantities. Avery products meant for double sided printing: Business Cards For inkjet printers: 8371 27871 28371 27881 8471 8376 27882 8476 8377 For laser printers: 5371 5376 5377 5911 Postcards For inkjet printers: 3263 8387 8383 8577 For laser printers: 5389 Index Cards - These are the same size as the postcards and may be an economical way to print quantities of postcards. For inkjet printers: 3381 Note Cards For inkjet printers: 3268 8315 For laser printers: 5315