PCB me 2 shtresa F4MB PCB me 2 shtresa R4350B PCB me 4 shtresa R4350B Rogers me 4 shtresa + PCB FR4 PCB rogers4003 me 4 shtresa PCB me 6 shtresa FR4 + Rogers PCB me 6 shtresa rogers4003 PCB me 10 shtresa R4003C