The Mead Security Envelope #10 is a high-quality product designed for secure shipping and mailing. With a weight of 20lb and a windowless design, this envelope provides privacy and protection for your documents and packages. This product comes in a convenient pack of 5 boxes, totaling 200 envelopes, ensuring you have an ample supply for your business or personal use. The Mead Mea-75214 model is a reliable choice for those seeking a durable and secure envelope solution.