... 25mm, ID: 13mm,H:9mm 2.Used for inductors High permeability toroidal core for inductors and transformers:Specifications:1.Shape:Toroidal ... Experienced technical staffd) Pass the ISO9001, RoHS certificationApplications:Mainly used for industry of computer, communication, multi-media, automotive, green lighting ... sell in Africa and Europe. High permeability toroidal core for inductors and transformers