All our book wraps contain 'peel & seal' strips with permanent strong adhesive for easy and efficient application and use. A pack of 20 x extra large C5-R size book wraps, also known as cardboard mailers. The size of these quality wraps is 415x355mm (length x width), and the depth is adjustable between 0-100mm. Perfect for mailing toys, games and puzzles up to A3 size, these are extremely high quality extra large cardboard mailers manufactured in the UK. The size of mailer represents the most cost effective and secure method to mail such items. The weight of each mailer is 238g. This range of book wraps are the same mailers as used by Amazon for mailing out their items, and the original Bukwrap brand.