Internal diameter: as customers’ requirements or drawings Wire material: copper ,aluminum,and ccaw wire for choose Bobbin height: as customers’ requirements Bobbin material: SV, PSV, KSV, BKSV, AL, ASV, BASV, ANSV, BHD, TGL, TIL, TSV, NSV for choose Width height: as customers’ requirements Layers: as customers’ requirements Resistance: as customers’ requirements