Quality Park Interoffice Envelopes, Ungummed, Brown Kraft, 4.5 x 10.375, 500 per Box, (63262) DURABLE: Made from heavyweight 28 lb. paper stock VISUAL CONFIRMATION: Holes punched on both sides of the envelope allow for visual confirmation of the contents without opening UNGUMMED: Ungummed closure makes it easy to reuse and easy to access and close MAXIMIZE: 3 Columns on each side with narrow ruling allows for maximum space for signatures GREAT VALUE: Conveniently packed in 500 count to reduce the frequency of repurchasing