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Item Number ENV500 Taxpayers and tax professionals use this envelope to easily mail estimate forms to the IRS. This envelope is designed for software-produced slipsheets, NOT the 1040-ES form, and with with filing instructions on theback flap. Size: #10 Top Window Size: 1 x 3 1/2 Top Window From Left Side: 1 Top Window From Bottom: 2 7/8 Bottom Window Size: 1 1/4 x 4 1/2 Bottom Window From Left Side: 3 1/2 Bottom Window From Bottom: 3/4 Weight: 24# Material: White Wove Flap Opening: Long Seal: Moisture Pricing is for 500 envelopes