Business Source Business Envelopes, 24 lb., No. 6, White (BSN42252) Pack of 500No. 6 3 4 business envelopes offer a contemporary style, double seam, fully gummed flaps and sturdy, 24 lb. white wove paper. Envelopes open along the top of the long end. General Information Manufacturer: Business Source Manufacturer Part Number: 42252 Brand Name: Business Source Product Name: No. 6 3 4 White Wove V Flap Business Envelopes Marketing Information: No. 6 3 4 business envelopes offer a contemporary style, double seam, fully gummed flaps