New Guardian Board Back Professional Envelopes are great for providing that added protection required when sending mail in the post. Each envelope is stamped with 'Please do not bend' on the front.
The pack of 125 C4 (324 x 229mm) envelopes are made from heavyweight 130gsm manilla paper which gives you peace of mind that your items will stay as secure as possible, especially when sending heavy items such as keys.
Forget any licking, sticking or taping, these envelopes feature a peel and seal flap with Power-Tac adhesive which is exceptionally strong.
These envelopes are smart with a two-tone finish, so they are great for professional use.
These manilla envelopes are plain and do not feature a window for your addressee, therefore you will need to do this manually.