The product is a set of 100 Staples #9 double window security-tint envelopes, measuring 3 7/8 x 8 7/8 inches. These white envelopes are designed for office use and come in a high-quality, durable packaging measuring L 12.3 x W 9.2 x H 4.2 inches and weighing 5.45 pounds. The double window feature allows for easy viewing of the contents while ensuring confidentiality, making them ideal for business and industrial applications requiring secure document transmission.