Use these self seal envelopes with business size checks printed on Check Launch blank check stock. The double cellophane windows and security tint ensure the privacy of information.Specifications:Size: 3 3/4" x 8 3/4"Top Window Size: 1" x 3 1/4"Top Window From Left Side: 3/8"Top Window From Bottom: 2 1/2"Bottom Window Size: 1 5/16" x 3 1/4"Bottom Window From Left Side: 3/8"Bottom Window From Bottom: 13/16"Weight: 24#Material: White WoveFlap Opening: LongSeal: Self Seal (Shipped Open)