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Upgrade your everyday post with our Blake's White self-seal envelopes. Just peel, press, and post—no mess, no hassle, and a secure seal every time. Pack of 1000 | 90 GSM Quality. Sealing Type: Self Seal | Convenient, pressure-activated closure with a latex strip on each flap that forms an instant, secure bond when pressed together, providing a quick, airtight seal without the need for additional adhesives. Size: DL+ Window (121 x 235 mm). Suitable for DL+ envelopes, where you can fold A4 paper into three equal parts. Model No. 16884