Economy Poly Mailer 14.5" x 19" 2.5 Mil Thick, Polyethylene Mailing Bags White 14.5x19 500 Pieces Lip Size: 1.5 +/- . 2.5-millimeter thickness (+/- 5%). Usable Dimensions: 14 x 19. Paper Liner: Clear with antistat. Adhesive: Synthetic rubber  Hotmelt,  minimum +/- 1/8.