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These Ryman Heavy Duty Envelopes are C4-sized, 115gsm and come in a pack of 25. These envelopes are heavy weight to ensure documents are safe during postal transport and have a peel and seal closure making them easy to use and more hygienic than standard gummed envelopes. They are ideal for sending A4 documents such as CVs which youÆd rather not fold and would be classed as a large letter when it comes to postal charges. These C4 Ryman Heavy Duty Envelopes are a must have for any school, home or office as they can be used for a variety of everyday purposes.