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There is also a continuous 10mm edge around the envelopes, for optimal tear resistance. An excellent environmentally friendly product at a fantastic price. 50 x Size AR3 (C/0 equivalent) Arofol branded gold padded bubble envelopes. These are equivalent to mail lite/feather-post size C and jiffy aircraft size JL0. The internal measurements of each envelope are 150mm x 215mm. Classed by Royal Mail as 'Large Letter' size. Arofol branded bubble envelopes are manufactured in the UK from excellent quality FSC paper, which is sourced from sustainable forests. The inside is lined with high quality bubble film.