Postsafe Extra Strong Polythene Envelopes are lightweight, tough and 100% recyclable. The high strength polythene construction is designed to be weather-proof, tear and puncture resistant, keeping your valuable items safe in transit. These opaque envelopes feature address panels for both writing and stamps. This pack contains 100 clear C4 envelopes measuring 240x320mm with a peel and seal closure.EnvelopesGBP85857