It is True Copper.

– Copper foil
– Tritec 7×0.5 mm tinned wire leads gives bigger surface by flexible connections,
– 630 VDC
– Tolerance : 2%
– No selfhealing construction
– IEC60384-1, EN130000, Ris >30000/C(Mohm,uF)
– Test V between terminals: Ur:630VDC, Ut:650VDC 1min. at 25C
– Test V between shor connected terminalsand case: 1000VDC, 1min at 25C
– Made for passive crossover network for loudspeakers only. Any othe useage is not allowed. Due to the construction.