The envelope is made of high-quality environmentally friendly special paper, giving people a sense of low-key luxury in terms of vision and touch. Different from the production method of Western envelopes, the entrance for loading letters is chosen to be a narrow side, and the envelope cover is in a triangular shape, which can seal the envelope outlet over a large area, making it difficult for letters to slip out. The hot stamping logo on the envelope cover reflects its exclusivity and is also very aesthetic.