Poly Mailer 100 Mailing Bags Plastic Mail Envelope for Shipping 2 Mil Lightweight Postal Bags (White, 14.5 x 19 inch) Adhesive: Synthetic rubber  Hotmelt,  minimum +/- 1/8. Lip Size: 1.5 +/-  & Paper Liner: Clear with antistat. Opacity: Business card inside the mailer should not be visible under UV light. White/Grey Exterior, Black Interior (Interior color of mailer is subject to change). 2-millimeter thickness (+/- 5%) & it is used to Ship Lighter Weight items.