3 Mil Poly Mailers Envelopes Shipping Bags Self Sealing, 500 Bags, 14.5" x 19" (White) Lip Size: 1.5 +/- . 3-millimeter thickness (+/- 5%). Usable Dimensions: 14 x 19. Paper Liner: Clear with antistat. Adhesive: Synthetic rubber  Hotmelt,  minimum +/- 1/8.