These cards are made of heavyweight strong cardstock. Each card is pre-scored and made of heavy-weight 110 lb white paper that feels thick and sturdy. Excellent for your office stationery, holiday greeting cards, birthdays, weddings, parties, showers, Mother's Day, Father's Day, Christmas cards, thank you cards, and invitations. Save money by making your own invitations and announcements. Also perfect for kids to create their own birthday invitations and thank you notes.