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These white #10 security envelopes are suited for everyday mailing in offices, schools and home workspaces. The 4 1/8 x 9 1/2 in. size fits standard folded letters, invoices, statements and routine administrative documents. A side-seam construction and 24 lb paper provide a clean professional presentation, while the 100-count pack supports easy replenishment for office supply rooms and purchasing teams. FSCĀ® certified and made in Canada, they are a practical choice for Canadian businesses, organizations and customers looking for dependable envelopes for regular correspondence.