The 115gsm heavyweight paper of these q connect manilla envelopes is tear resistant thanks to the basket weave structure making the envelopes suitable for heavy documents such as catalogues these envelopes feature an easy seal self adhesive flap just insert your letter fold the flap over and press down to seal theres no gum and no licking required the smooth manilla paper allows you to write or print addresses with complete clarity manilla envelopes for secure sending of documents quali