6 x 9 Booklet Window Envelopes in 24lb. Bright White are a professional way to send flat but bulky materials like pamphlets, brochures, sales literature, booklets, annual reports, magazines, or catalogs. Save the time and expense of separately addressing envelopes by position the address to show through the window. These top quality envelopes are sealed by a moistenable glue located on the inside of the back flap. Available both plain and custom printed for company branding and creative uses. Pack of 250.