You can use these document envelopes from the 123ink for sending business letters, brochures and documents. The envelopes measure 220mm x 312mm - EA4. These envelopes have a self-adheisve closure, which makes sealing the envelopes quick and easy. There is a window on the left side. The package contains 250 pieces.
Of course this 123ink product also comes with a 100% warranty!