Standard 2.4mm diameter shaft. Sterilization: Ethylene oxide gas or steam autoclave. Reusable Electrodes are manufactured of high quality surgical grade materials in ball, blade, needle, angled ball, tungsten loop and conization styles. Reusable Electrode Extensions provide improved access to deep cavities and other hard-to-reach surgical sites. Can be used with ball, blade and needle electrodes in handswitching and footswitching Valleylab pencils. Available in 13cm or 34cm lengths.