The Amazon Basics Security Self-Seal Mailing Envelope is a pack of 100 white envelopes designed for home or office use. These rectangular envelopes feature a secure self-seal closure, making them ideal for mailing important documents or items. With dimensions of 6.73×3.89×3.14 inches, these envelopes are lightweight at 0.85 pounds and come in standard packaging. The brand, Amazon Basics, ensures quality and reliability for all your mailing needs.