A5/C5/A4/C4/A3/C3 Envelope Self-Seal Hard Board Backed Envelopes Packaging
C4: 32.2 x 22.7. C5: 22.8 x 16.1. C3: 45.6cm x 32.5cm. Simply peel off the strip and press the flap down to secure. These envelopes are suitable for both professional and personal use, even capable of sending larger photos safely.