Classed by Royal Mail as 'Letter' size. A pack of 50 x Size A (000) Jiffy Airkraft Padded Bubble Envelopes. These are equivalent to mail lite/feather-post size A- the internal measurements of each envelope are 90mm x 145mm.
50 x Jiffy Airkraft Size 000 (A) Padded Envelopes 90x145mm[5055502314471]