Details
Business Reply Card are used in many situations to allow the recipient to reply by mail without paying for the postage. Newprint prints them on Husky® or Domtar® 7pt Reply Card (116.92 gsm, 79 lb.)
In marketing, a small, pre-addressed card included in a piece of mail allowing the receiver to reply to the sender without charge. This is used for mail sent to a large number of people and/or organizations. A card may be inside a periodical, for example, and it may allow the receiver to submit his/her subscription renewal without a stamp. A mailer pays Canada Post or the U.S. Postal Service a flat, annual fee to be able to use business reply cards.
Aditional information about BRC
USPS
https://faq.usps.com/s/article/Business-Reply-Mail
Canada Post
https://www.canadapost.ca/web/en/kb/details.page?article=getting_started_with&cattype=kb&cat=sending&subcat=dmcreationqualification
https://www.youtube.com/watch?v=JZdxNWjbU20&feature=emb_logo