Specifications include, but are not limited to:Treasury Window Envelopes - #10 Check Window (E-100), Quantity: 160 cartons (400,000 envelopes), Envelope Size: 4-1/8" x 9-1/2", Window Size: 1-1/8" x 4-1/2"Custom Window Position: 1-3/4" from left side and 13/16" from bottom. To be printed one side, black ink on 24 lb. white wove recycled stock. Envelope must have diagonal seams and must be constructed as shown in the attached PDF file. Envelope is to have black wood grain inside tint, clear poly window and gummed flap.