2.75 inch (7 cm), Blunt Needle Electrode
2.75 inch (7 cm), Blunt Needle Electrode Modified
4 inch (10.16 cm), Extended Needle Electrode
2.75 inch (7 cm), Blunt Needle Electrode
2.75 inch (7 cm), Blunt Needle Electrode Modified
4 inch (10.16 cm), Extended Needle Electrode