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These C4 envelopes are white and have a clear window for your addressee, which is ideal for professional business use. The envelopes are Pocket closure with the seal conveniently on the side for a landscape orientation. The window on these envelopes is positioned at 24mm in, 213mm up at 40 x 105mm size for your address. Size: C4 Quantity: 250 Position: Pocket 24mm in, 213mm up Window size: B at 40 x 105mm GSM: 100 Self Seal