Wausau Astroparche 24, Fine Business Stationery, #10 Envelope, 50 Count, Natural, 4.12 X 9.5 Inches (26125) Acid and lingin free for great quality that doesn't deteriorate Inkjet, laser, copier and offset guaranteed Envelopes to ensure that everything you mail makes a great impression The paper is made with 30 percent recycled post-consumer fiber 50 Envelopes