Yes it is. Also used during WW2 by P.O.W's to tailor clothes, forge papers etc. If anyone wants to understand the logic behind the SAS tin. Go look at the Imperial War Musieum's display on POW's escape kit's and lenth's that H.M. Goverment went to in order to get extra gear to them in Red Cross food parcels etc. Quite enlightening. Got a few idea's that are of use to us as well.