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Quality white cardboard / solidboard envelopes made from strong approx 625 micron board Complete with brown corrugated 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 12" LP records / vinyls. Approximate external size of envelope - 340mm x 340mm (excluding sealing flap), approximate size corrugated pad - 320mm x 320mm.