C4 & C3 Envelope Backing Boards 800 Micron | Rigid A4 Support Card | Extra Thick
A4+ & A3+ oversized to fit C4 C3 envelopes perfectly.NO MORE DENTED CORNERS! Perfect fit for C4 & C3 envelopes – oversized A4 / A3 to perfectly fit inside C4/C3 Envelopes. A4+ = 305x218mm with C4 perfectly.