10" x 13" 2.5 Mil Poly Mailers Self Seal Shipping Mailing Envelopes Bags White Pack of 100 Lip Size: 1.5 +/- . 2.5-millimeter thickness (+/- 5%). Usable Dimensions: 10 x 13. Paper Liner: Clear with antistat. Adhesive: Synthetic rubber  Hotmelt,  minimum +/- 1/8.