W-2 Laser Double Window Envelope, Commercial Flap, Gummed Closure, 5.63 X 9, White, 24/pack This TOPS™ envelope pack provides tax envelopes for W-2s. Preprinted with IMPORTANT TAX RETURN DOCUMENT ENCLOSED on front. Left aligned double windows fit your W-2 forms precisely to conceal all personally identifiable information. A security tinted pattern keeps confidential information safe, even when held to light.