2.5 Mil Poly Mailers Shipping Mailing Bags, 12" x 15.5", White Self Adhesive Bag 300 Pieces Lip Size: 1.5 +/- . 2.5-millimeter thickness (+/- 5%). Usable Dimensions: 12 x 15.5. Paper Liner: Clear with antistat. Adhesive: Synthetic rubber  Hotmelt,  minimum +/- 1/8.