Ideal for sending checks and sensitive documents, the 6 3/4 white tinted envelopes are a must for any office or business. The opaque security tint lines the inner walls of the envelope and makes it impossible to view the content from outside. Made from 24lbs stock paper, these envelopes have a gum activated sealing mechanism. The 6 3/4 envelope fits neatly inside a #9 or #10 envelope, which means it can be used as a return envelope. These envelopes are made from high-quality pure white paper that can be written and printed on with much ease.