#8 5/8 Window Envelope - Blue Inside Tint - 24# White (3 5/8 x 8 5/8) - Window Envelope Series (Box of 500) A Quantity of 500 - #8 5/8 Single Window Envelope - Lined 24# White Wove Paper - Window: 1 x 4. 1 from Left. 3/4 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