Each one contains a booklet opening

paper that reinforces protection from damage

and one with a "Download Software" button

JAM Paper Black Linen 9

0 - concentrateur USB 3

JAM Paper 10 x 13 Open End Catalog Envelopes with Gum Closure, Brite Hue Christmas Red Recycled, 50 Pack VariesBy:envelope_colour_17838:Red|envelope_size_8174:10" x 13"|envelope_pack_size_1000101:50 Pack Each one contains a bookletJAM Paper original Coloured Open End Catalog Envelopes are a great alternative compared to the same old white or manila catalog envelopes. These envelopes are made from either 24 lb., 28 lb., or 32 lb. sturdy paper, measure 10 x 13 inches, and have a moisture activated gummed flap closure. They are great to use for organizing documents, distributing marketing materials, mailing or filing. Flap is on the shorter side of the envelope.