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LUX 9 x 12 Booklet Window Envelopes in 28lb. Bright White perfect for organizing documents/promotional materials/marketing materials/mailings/filing, sold as 1000 per box. 9 x 12 Booklet Window Envelopes in 28lb. 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.