#10 Window Envelope - 24# White ( 4 1/8 x 9 1/2) - Fast Forward Envelope (Box of 250) A Quantity of 250 - #10 Single Window Envelope - White 24# White Wove Paper - Window: 1 1/8 x 4 1/2. 7/8 from Left. 11/16 from bottom. Great for mailing Invoices, statements, catalogs or announcements. This envelope may be sourced from any one of a number of top brands. Ships via UPS Ground