- 100 Count Thank You Cards - Size 3"x4" - Printed on Extra Thick 18pt. Cardstock - Smooth Matte Finish - Colorful, Festive, Playful look - Single Side Print - Blank White on Back to Write if Desired - Cards Only, NO Envelopes Great way to show gratitude for Online Sellers or as a Thank you note for attendance, retail, services, purchases, grateful, or Invitations Etc...