PremierTeam C4 (324 mm x 229 mm) white envelopes suited for A4 sheets. Self seal, with window to see the address and security printed inside. PremierTeam quality, heavyweight 100gsm white envelopes give you a professional look for every letter or mailing that you send. Envelope size C4 (324 mm x 229 mm , or 12 3/4 x 9) is perfect for unfolded A4 sheets. A standard size window allows the recipient address to be displayed. The self seal flap on the short side has latex adhesive on both sides for a quick, easy and secure seal when pressed together. Packed in crush proof boxes for safe storage.