Store and mail significant documents in one secure place with cello sleeves. These cello sleeves are a unique alternative to the standard envelope and have been USPS approved for sending various mailings! Our sleeves have a secure self adhesive strip closure, measure and are fashioned from acid-free sturdy translucent plastic. They are popularly used for delivering promotional/marketing materials, artwork, invitations, personal mail, greeting cards, and bulky items. They are also excellent for storing photos, important documents, and more! From personal to professional mailings, these unique envelopes cater to all your needs in superior efficacy.Details:Available in multiple colors5.43" x 8.62" each100 sleevesSelf adhesive closureAcid freeSturdy translucent plastic