Town hall Securitex envelopes are tear- and water-resistant envelopes. These envelopes are of a thickness of 3.8cm very suitable for the safe sending of catalogs, thick and important documents. This sturdy envelope is a perfect alternative to Tyvek envelopes. The non-transparent, white envelopes ensure that the content remains invisible. The set includes 5 large size envelopes from 262mm x 371mm x 51mm.