Clear View Poly Mailer Shipping Mailing Envelopes Bags 9" x 12" White/Grey 2 Mil 400 Pack Adhesive: Synthetic rubber  Hotmelt,  minimum +/- 1/8. Lip Size: 1.5 +/- ; Paper Liner: Clear with antistatic. Opacity: Clear front allows for easy viewing of contents. Usable Dimensions: 9 x 12 & Backing Thickness: 1.57 Mil; Front Thickness: 2 Mil. White/Grey Exterior, Black Interior (Interior color of mailer is subject to change).