... for speaker,Speaker Parts1)Bobbin Material: AL,ASV,KSV,Capton,Glass-fibre,NSV,TIL,BASV,PSV,etc.2)All models and sizes ... . name: speaker voice coil bobbin material AL,ASV,KSV,Capton,Glass-fibre,NSV,TIL,BASV,PSV,etc. bobbin shape round, not round ...