Keep your mail secure with the Member's Mark? Security Envelope #6-3/4 (500 ct.). This box contains 24-pound on envelopes made with white woven paper, which gives your correspondence a clean, professional look. The interior security tint keeps contents private, adding enhanced security during the shipping process. These envelopes also boast peel-off self-adhesive closures.Want An Easy Way To Send a Lot Of Mail?Are you sending a lot of mail? This large box of envelopes is a great choice to stock