Seal your confidential files: internal envelopes tailored to you Keep your internal documents secure and organised with the Lyreco specially designed internal envelopes, ideal for facilitating smooth and private communication within your workplace. Whether it's important correspondence, marketing materials, or financial documents, these C4 (A4) envelopes are tailored to provide a secure and presentable mailing solution for various business needs. They are expertly made from high-quality paper, providing a reliable and eco-friendly solution for your documents. With a grammage of 85 gsm they offer a sturdy and reliable solution for securely storing your important documents. Streamline your interdepartmental mail with these envelopes, a practical solution for everyday office needs. Stock up now!