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Our C3 White All Board Envelopes are a presentable and reliable option for sending A3 size documents, prints, photographs and other large items. These all board envelopes are constructed from premium grade 500 micron, 350gsm, GD2 fully coated white chipboard to offer a high level of protection for your items. Their smooth white surface is printable and great for sticking address labels for a professional-looking, neat finish. Their pre-folded flap with a speedy peel and seal strip keeps packing quick and secures your items inside the envelope.