Made of smooth, high-quality, 28 lb. paper. Their size makes them ideal for fitting standard-size sheets of paper without bending or folding! These envelopes have a straight flap with a reliable gum closure. Send letters, documents, forms, files, certificated, manuals, manuscripts, and more from your office or home with ease! Use them for personal and professional mailing purposes.Details:Black9" x 12" each28lb.Available in multiple countsGum closure