Quickbooks Size Double Window Envelope - Inside Tint - 24# White (3 5/8 x 8 3/4) - Double Window Series - Self Seal (Box of 1000) A Quantity of 1000 - Quickbooks Size Envelope - Double Window - Peel and Seal Flap 24# White Paper - Top Wdo: 7/8 x 3 1/2, 3/8 from Left, 2 7/16 from bottom. Btm Wdo: 15/16 x 3 1/2, 7/8 from left, 11/16 from bottom. Great for mailing checks, letters, invoices, statements, contracts, and more. This envelope may be sourced from any one of a number of top brands. Ships via UPS Ground