JAM Paper 9" x 12" open end envelopes are made out of 28lb, high quality paper. These envelopes are ideal for enclosing standard sized sheets of paper to be mailed. Use them to send documents, files, forms, letters, applications, packets, manuals and more! These open end envelopes feature commercial style flaps with reliable gum closures to keep items secure in transport. This pack contains a convenient total of 25 envelopes for any home or office mailing need. Details:Available in multiple colors 9" x 12"28 lb. paper25 envelopes