Clear Cellophane Sleeves are a great way to protect & enhance your greeting cards, invitations or promotions. Self-adhesive closure, acid free, and archival quality, as well as, USPS approved (make sure to use self-adhesive stamps). The size for the cello sleeves is given in width x length. The re-sealable adhesive strip is located on the width of the envelope, which is typically the shorter side (as can be seen in each picture). With these envelopes you never have to worry about your content falling out with those strips! With over 25 sizes to choose from, you'll surely find one that fits your material. From small invitations to oversized presentations, these cellophane sleeves will certainly keep you covered.