All "Premier Line" Top Tab full height gusset Jackets have the heaviest manila liners used. Tyvek™ Gussets are made from Tyvek™ and reinforced lined with heavy duty poly. Paper gussets are reinforced with "Tear Resistant" clear poly to help prevent tearing. Straight 1/2" full top tab. Expansions are 9" high on letter & legal and 9 1/2" high on full legal for added strength. Full height expansion helps prevent documents from falling out. "Full Legal" size pockets allow for filing legal size folders securely.