What is this?Envelopes can be used to hold cards, small note cards, thank you cards, greeting cards, business cards, invitations, small thank you letters, gift tags, etc., suitable for birthdays, weddings, parties, events, festivals, celebrations, anniversaries, business, graduations, and other occasions.What will I get?The Silver Card Envelopes provides here, are in the size 103 x 71.9 mm / 4.05 x 2.83 inch (LxW)In the package of: 50 Pcs x Cards HolderAre there any advantages of the product?Heart-shaped Design: The envelopes are made of fine texture and sturdy pearlescent paper, and the seal is heart-shaped, high-end, and elegant, not easy to deform, and can protect your cards or letters.DIY Design: The blank surface of the card envelope provides ample DIY space for you to draw, write, and graffiti to create personalized, meaningful, and interesting envelopes and cards.How to use it?The heart-shaped clasp can easily open the envelope, put the card into the envelope, fold it along the crease, and fasten it with the heart-shaped buckle.What should I notice?This envelope does not contain glue.