The A4 White Rigid Cardboard Envelopes by Senjeok come in a pack of 100, measuring 325 x 230 mm (C4 size). These self-seal envelopes are perfect for packaging and shipping, offering a secure and professional solution for your business or office needs. With a sleek white design, these envelopes are versatile and ideal for various mailing requirements. The rigid cardboard material ensures durability and protection for your documents or items while in transit.