500 No. 10 Double Window Security Envelope, Diagonal Seam, Gummed Seal, Perfect for Statements, QuickBooks Invoices, and Return Envelopes, Number 10 Size, 4 1/8 X 9 ½

#10 envelope, double window with diagonal seam, is perfect for mailing an invoice, billing statement, check, and other business mail. Your return and sender address will line up perfectly in our standard size double windows Just moisten or lick and seal for a strong lasting seal. Our cost effective gummed seal design will quickly and easily create a strong seal for completely secure business mail. No need to spend time and money stamping, adding return labels, or spending extra money on custom envelopes, just easily slide your addressed business mail into our diagonal seam envelopes to create professional looking business mail Save time quickly stuffing multiple pieces of business mail or return envelopes in the wide throat and large commercial #10 window envelope with traditional diagonal seams. Provides complete business mail security, as your sensitive business mail will be completely hidden from prying eyes with our dark black security tint design.