These quality white wove envelopes with address window are extra strong to help ensure the safety and protection of your mail in transit. The opaque interior helps to ensure your documents remain confidential and the bright white exterior provides a professional finish, ideal for business correspondence. A 25mm gusset makes these the ideal choice for mailing bulkier items and they also have a peel and seal closure for ease and convenience. This pack contains 125 C4 envelopes.