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A Quantity of 500 - White 6x9 Booklet Envelopes are great for mailing letters, cards, invoices, statements, documents, brochures, small catalogs and booklets, and more. The booklet style envelopes open on the long, 9-inch edge. They have a standard gum seal that requires moisture to seal. To use, insert your items, moisten the seal, and press to close. The side open envelopes make inserting bulky items simple. These are perfect for a larger stack of documents that is slightly too large for a standard #10 business envelope. Fold your documents in half instead.