Classed by Royal Mail as 'Large Letter' size. 2000 x Size C (0) Jiffy Airkraft Padded Bubble Envelopes. These are equivalent to mail lite/feather-post size C - the internal measurements of each envelope are 140mm x 195mm.
2000 x Jiffy Airkraft Size 0 (C) Padded Envelopes 140x195mm[5055502314815]