This is a plain white cardboard CD mailer.Includes space for a CD and an extra insert. Comes with a peel-off glue strip and zipper. The mailing weight with a CD is 39 grams and the mailing thickness is 5mm. The threshold for Canadian lettermail is 5mm so this item will usually pass at the most economical rate. The US threshold is 6.35 mm (or 1/4 inch) so it should be fine for USA mailing.