#9 Window Envelope - 24# White Wove (3 7/8 x 8 7/8) - Window Envelope Series (Box of 1000) A Quantity of 1000 - #9 Single Window Envelope - 24# White 24# White Wove Paper - Window: 1 1/8 x 4 1/2. 7/8 from Left. 1/2 from bottom. Great for mailing checks, invoices, statements, letters, collecting payments, and more. This envelope may be sourced from any one of a number of top brands. Ships via UPS Ground