Self Seal Envelopes Come With A Sticky Band Of Latex Glue On The Flap That Is Covered By A Protective Strip Of Paper Or Plastic. To Seal These Envelopes, Simply Peel Off The Protective Strip To Reveal The Sticky Strip, Then Fold The Flap And Press Closed To Form A Bond. Envelope Are Made From Paper And Plastic Net Making It Story And Long Lasting.