Pack of 100 Self Seal Double Window for 4 up W2 forms, Made in the USA by Next Day Labels TM Pack of 100 Envelopes (NOT Forms JUST Envelopes) Designed to fit the 4up (Quadrant) W-2 forms Size of Envelopes is 5-3/4″ x 8-3/4″ Self Seal Envelopes – Security Tint Inside Made in the USA by Next Day Labels TM – 100% Guaranteed