This Self-Seal W2 envelopes will perfectly fit computer printed 2-part W2 tax forms. This Self-Seal W2 envelopes will perfectly fit computer printed 2-part W2 tax forms. 50 Pack W2 form Envelopes, Designed for Printed W2 Forms from Quick books or Similar Tax Software -Self-Seal,Double-Window, Security Tinted. Sized at 5 5/8 Inch x 9 Inch.Black security tint designed. Your W2 two part forms will slide into our envelopes with ease and not shift during transit. Set of 50 Tax Envelopes, IRS Approved.