These envelopes are great for postcards, thank you note, greeting cards, and also suited for invitations, weddings, birthdays, parties, graduations, business, and any other use you can think of.SpecificationColor: WhiteMaterial: CardboardThickness: 1mm / 0.04 inchOverall Dimension: 16 x 11cm / 6.3 x 4.3 inch (L*W)Package Content: 10 x Colorful EnvelopesAdvantagesMade of sturdy and durable paper in fine workmanship, reliable, wear-resistant, and is not easy to break.Comes a sufficient quantity can meet your various needs, and keep the contents in good condition.InstructionEasy to use: Insert the letters into envelope, then fold the closure and put the glue or sticker on it to increase the closure tightness.NoticePlease kindly note that this envelope does not include glue.