Quality Park 10 x 13 first class catalog envelopes have speedy self seal closures; press it, seal it and fly through your daily mail routine; 100/BX A first class border attracts first-class attention; give your message importance with this office supplies envelope staple recognized by the USPS Redi-Seal envelopes have 2 adhesive sides; press closed for a clean, sanitary seal without envelope moisteners or clingy strips; no water, no waste Inkjet printer compatible and perfect for use with address labels; not recommended for the laser printer A great value; large envelopes are an economical way to send manuscripts, certificates or other documents you’d rather mail flat