the envelopes have a little mark on them from the back ring see photos. The Quality Park Interoffice Envelopes are perfect for efficient and organized communication within an office setting. Measuring 10 x 13 inches and packaged in a case of 100, these envelopes are ideal for transmitting documents and letters securely. With the trusted brand of Quality Park, you can trust the quality and reliability of these interoffice envelopes for all your business communication needs.