These Quality Park 9" x 12" catalog mailing envelopes have a quick-and-easy Redi-Strip closure. Just peel the paper strip and press for a strong, durable seal. Redi-Strip envelopes are the perfect mailroom update for concerns about surface germs in the workplace. Skip the yuck, stay safe and save time with every mailing. Plus, the peelable paper strips protect your adhesive from dust so envelopes last longer in storage. These self seal envelopes are inkjet printer compatible, though not recommended for the laser printer. (Use labels instead.) Heavyweight 28 lb kraft paper is opaque to protect private contents and durable enough for lots of hard office tasks. Center seams give added strength for heavy contents. Don't settle for bulky white #10 envelopes with double-folded inserts or more expensive oversized flats. Our large envelope can store letter-sized papers flat without ugly folds and creases. This 9 x 12 is the perfect compromise for cost-effective, professional-looking mailings with a little room to spare. Ideal for photos, art prints, certificates, registration materials or any letter or oversized papers you prefer to send flat. Stock up on boxes before you're out. 250 Per box.