Avery 3378 Textured White Greeting Cards & Envelopes, 5-1/2 x 8-1/2", Box of 30. Avery Half-Fold Greeting Cards 3378. This pack of 30 textured matte white 5-1/2” x 8-1/2” cards with smooth envelopes is perfect for wishing your friends and family a happy holiday season or inviting them to a party. Made from heavyweight cardstock, these blank greeting cards offer a textured finish for vivid color and sharp text and come pre-scored to make folding hassle-free. Write on the blank cards or use your own graphics, photos and text. You can also customize your cards with free templates, designs and fonts at avery.com/templates. Print out your creations on your inkjet printer and enjoy jam and smudge-free performance every time. Best of all, this pack of 30 greeting cards comes with envelopes designed to perfectly fit with your cards. Great for birthdays, holidays, invitations, announcements and more. Few things say, "thinking of you," quite like a custom-made card.