✅ The product is a set of 50 black poly mailers from the brand. These 10×13 shipping envelopes are made of durable polyethylene material and feature a self-sealing design for easy packaging and mailing. ✔️ self-sealing ✔️ high adhesion ✔️waterproof ✨Perfect for businesses and individuals needing a reliable and affordable shipping solution, these poly mailers offer a convenient and secure way to send items through the mail.