JAM PAPER Opal Stardream Metallic Invitation Envelopes offer a consistent, attention-grabbing metallic finish across multiple A-size formats. Made of 32-lb acid-free paper to resist yellowing and fading, they include a moisture-activated gummed closure and straight-flap design to help keep contents secure. Each pack contains 25 envelopes with the Stardream Opal metallic sheen, ideal for wedding invitations, greeting cards, RSVPs, thank-you notes, holiday mailings and other special-occasion correspondence. These envelopes are paper-based, not water- or moisture-resistant, and provide a smooth, high-visibility finish to enhance printed or handwritten inserts.