blank postcards - 100-sheet 200-cards printable postcards, 2-up perforated laser and inkjet printer postcards, self mailer mailing side postcards, white, 8.5 x 5.5 inches per postcard best paper greetings this pack of 200-count postcards will prepare you for all your card-sending needs! cut the hassle of rushing to the store and overpaying for cards. this pack consists of 200 response postcards to accompany all your invitations. all postcards are printed on heavy 170 gsm card stock that is durable and easy to write on. make a statement with these postcards when you send them out for weddings, receptions, parties, and other events. each card measures at 8.5 x 5.5 inches which conform to usps first class mail rate size requirements. make sure you have plenty of postcards on hand to send to everyone on your guest list.