... not round, etc inner diameter13mm to 120mm(1",1.25",1.5",1.75",3",4",4.7”etc) bobbin Height1 ... 150ohm wire layer1,2, 3,4,6,8,10,12 layer, etc wire materialPE,EI,CCAW,CCAW-HTW,PECCAW, ... best to meet your needs,and our factory: 1 12 years of production experience2 Customers have Panasonic,SONY,YAMAMA ... carton for package(Carton pass the compressive tester).1.Our company has an independent right of import ...