DURABLE MATERIAL: Made of special paper, these envelopes are thick and durable, perfect for writing and long-term storage. Size: The size of our vintage envelopes is 23*16cm. You can lay A5 paper flat. The metal buckle design makes the envelope seal more secure and also makes opening the envelope more ceremonial for the recipient. Multiple Choices: We provide four colors for you to choose from. Meet your different needs and preferences. Multi-purpose Envelopes: You can use it to place greeting cards, stationery, small gifts, documents, invoices, etc. Perfect for Father's Day, Mother's Day, weddings, and other holidays.