Business Source Security Window Envelopes, No. 10", 4-1/8"x9-1/2", 500/BX, White (BSN42205) Box of 500No. 10 business envelopes feature an address window and a security tint to secure your documents. Design also features a white wove material, diagonal seam and gummed seal. 24 lb. General Information Manufacturer: Business Source Manufacturer Part Number: 42205 Brand Name: Business Source Product Name: No. 10 Tinted Diagonal Seam Window Envelopes Marketing Information: No. 10 business envelopes feature an address window and a security tint to secure