Triplast 500 x C6 Window Self Seal Security Envelopes (Size: 114x162mm) | Address Window, Self Sealing & Printer Safe Mailing Paper Envelopes | Ideal for Everyday Home, Office & Commercial UseCONTENTS: Pack of 500 White Window Mailing Envelopes SIZE: C6 LENGTH: 114 mm 4. 49 in WIDTH: 162 mm 6. 38 in THICKNESS: 90 gsm MADE in the UK ENHANCED SECURITY: These envelopes feature a see through window to display essential information such as addresses and a blue high security pattern on the inside that scrambles text to ensure contents remain concealed when in transit or storage. HASSLE FREE & PRACTICAL: The self seal adhesive eliminates the need