1000 Pcs 6" x 9" Poly Mailers 2.5 Mil Envelopes Shipping Bags with Self Sealing Strip, White Poly Mailers Lip Size: 1.5 +/- . 2.5-millimeter thickness (+/- 5%). Usable Dimensions: 6 x 9. Paper Liner: Clear with antistat. Adhesive: Synthetic rubber  Hotmelt,  minimum +/- 1/8.