Envelope - 9 x 12.5, White, Self-Seal, Box of 100 is a dependable mailing envelope for everyday mailing, filing and document handling in homes, offices, schools, clinics, retail counters and busy mailrooms. It features polyethylene. White, grey interior. Self-seal closure. 2.5 mil thick. Key details include 9 x 12.5 in, white, box/pack of 100. The self-seal closure makes it simple to prepare letters, forms, invoices, statements and other documents while helping keep contents neat, protected and ready for delivery. Its practical size, pack quantity and ready-to-use design help customers choose the right supply quickly, stay organized and maintain a smooth mailing workflow for routine correspondence and administrative tasks.