SAVE WITH SELF-STICK: Quality Park double-window security envelopes have a fold-away self-sealing flap that saves you time & money HASTE, NOT WASTE: Our REDI-SEAL envelopes don’t require moisture, seal instantly & won't close and stick before you're ready—you won't find ruined samples in the box FORMATTED FOR HEALTHCARE: Single window is positioned to display the name and address from a tri-fold CMS-1500 without revealing private information