Speaker Voice Coil Speaker Parts 1)Bobbin Material: AL,ASV ... ,TIL,BASV,etc. 2)All models and sizes Speaker Voice CoilSpeaker Parts1)Bobbin Material: AL,ASV,KSV,Capton,Glass ... We can supply all kinds of speaker voice coils according to your requirements. Speaker voice coil bobbin materialAl, ASV, KSV, ... shaperound, not round, etcinner diameter13mm to 100mm (1",1.25",1.5",1.75",3",4",etc)bobbin Height2.5mm ...