This gum seal double window envelope works with 1099 2up forms. These white envelopes have security tint and cellophane windows to ensure the privacy of information. Save time with these envelopes - just stuff, seal and send. They're designed to be perfect companions to your 1099. Quality construction stands up in the mail. Reduce mailing delays - mailings fit perfectly, so destination and return addresses don't slide out of view. Mail with peace of mind. Recipient's address and your preprinted return address show clearly. Measurements: Envelope: 5 3/4 x 8 7/8 Top Window: 1 1/8 x 3 3/8 - 1/2 from left, 3 3/4 from bottom Window: 3 3/8x 1 7/16 - 1/2 from left, 1 1/2 from bottom. Additional Details ------------------------------ Package quantity: 1