White Cover Stock - 67 Lb Vellum Bristol, 8.5 X 11 Inches, (50 Sheets Per Pack.) 50 sheets per pack - White Cover Stock laser Inkjet and copier guaranteed. Forest Stewardship Council (FSC) certified, 30% Post-Consumer Recycled Content. Performs in personal and professional print devices for medium to heavy weight applications. Acid-free and lignin-free for long lasting documents. 67 lb. Bristol meets USPS 7 pt. minimum requirement for business reply cards.