Tyvek White C4 Window P/S Envelope Pk100

The unique fibre structure of Tyvek Security Envelopes, developed by DuPont, is tear and water resistant for extra security during transit. The envelopes also feature an extra strong hot melt peel and seal closure, and are lightweight to help keep postage costs down. These C4 envelopes measure 229 x 324mm and are 100% recyclable. This pack contains 100 envelopes with a convenient address window measuring 55 x 90mm.