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Quality brown cardboard / solidboard envelopes made from strong approx 625 micron board Complete brown courrugated cardboard stiffener pads Envelopes include hot melt adhesive peel + seal / self seal strip on the closing flap, for security. Envelope also has hot melt glued seams for added strength Use for posting your 7" or 45rpm records / vinyls. Approximate external size of envelope - 203mm x 203mm (excluding sealing flap), approximate size corrugated pad - 190mm x 190mm.