The term par ensembles illustrated in this page are giving with ceramic protector pipe. Another ensembles type could be given convening the elements in noble metal or metal base with the ceramic pipes.
NOBLE METAL THERMOPAIR ENSAMBLE
The thermocouple elements illustrated on this page are used in the thermocouple assembly, these elements are also sold or repaired separately for later assembly, these parts come in an insulating ceramic bar. type r, s and bare (Bare and ceramic stranded thermocouple cable) are made with a TIG (Tungsten Insertion Gas) welding system.