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Sturdy and reliable, our board back envelopes keep documents flat and protected in transit. Perfect for mailing certificates, photos, and important paperwork. Pack of 125 | 120 GSM Quality. Sealing Type: Peel and Seal | Easy-to-use, secure, and tamper-proof closure with a self-adhesive strip for fast, reliable sealing without moisture or heat. Size: C4 (324 x 229 x 50 mm), with a gusset capacity of 50 mm for thick or bulky contents. Suitable for C4 envelopes, where you can fold A4 paper once. Model No. 93935M