Supremex T4 Tax Single Window Envelope - Single Window - 5 3/4" (146.05 mm) Width x 9" (228.60 mm) Length - 24 lb (10886.22 g) - Wove - 500 / Box

Single-window envelopes are used to carry T4 Tax Forms with a window for the name and address to appear. Envelopes offer an open-side, side-seam design for proper insertion of documents. The 24 lb. envelopes are security-lined for your privacy.