Adams W-2 envelopes are security tinted for privacy and sized for a precise fit with W-2 tax forms. Self sealing envelopes don't require moisture so you save time and reduce the mess of bulk mailings. Just peel & seal. These double window envelopes have a complex security tint to obscure the appearance of letters and numbers. Keeps social security numbers and private data hidden, even when held to light. Precisely sized and aligned double windows ensure personal data is always out of view. Designed to fit standard IRS W2 forms. 5-5/8" x 9". 25 Per pack.