These Quality Park 9 x 12 white catalog envelopes have speedy self seal closures; press it, seal it & fly through your daily mail routine; box of 100 Redi-Seal envelopes have 2 adhesive sides; press closed for a clean, sanitary seal without envelope moisteners or clingy strips; no water, no waste Bright white 28 lb white wove paper envelopes lend a clean, professional look to mailings; strong enough for shipping, sorting or organizing 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