These Pen + Gear envelopes are 10"x13" in dimension. The color of the envelope is brown. Extremely spacious and provides a good storage for bigger documents and papers. The peel and stick strip on the envelope helps in sticking the envelope openings . The envelope comes in a pack of 20 which is convenient for mailing for almost an entire month. The envelope is great for mailing the documents for the business purpose and can also be used for personal use as well.