Special Electrode, 1mm thick Ag-AgCl mounted in an epoxy ring housing. Electrode is encapsulated with a durable epoxy coating that provides a long lasting, waterproof electrode. Can be used indefinitely with some care. Shielded lead wire length: up to 40” (100cm). Standard lead wires are PVC insulated multi-strand copper with internal Tinsel for additional strength. Easily cold sterilized and used for a variety of applications such as EEG, EMG, EOG, etc.