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. Details: Dark red 9" x 12" envelope size 28 lb. paper Commercial style flap with gum closure Available in multiple counts Paper