The CP 055.01 secure book wraps provide robust and secure wrap-around protection when sending A4 ring binder files. The pre-creased grooves allow you to adjust the mailer for a snug and secure fit around standard 35mm files and up to 80mm to fit the larger lever-arch folders. These boxes have reinforced edges and double peel and seal adhesive strips to offer enhanced protection during transit, and an easy open tear strip for a frustration free customer experience when your items arrive.