Universal® Peel Seal Strip Business Envelope, #10, 4 1/8" x 9 1/2", Window, White, 500/Box - Sam's Club
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4 1/2 x 9 1/2 Custom Window Envelopes, 24lb. Bright White, Window Size: 1 1/4 x 4 1/4 (7/16 left, 2 1/16 bottom) | Envelope Superstore
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