PremierTeam C4 (324 mm x 229 mm) white envelopes suited for A4 sheets. Self seal, plain envelopes with security printing inside. PremierTeam quality, heavyweight 100gsm white envelopes to 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. These envelopes are plain white, with security pattern interior so the contents cannot be seen through the envelope. 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, 250 envelopes per box.