Set of 3 Electrodes for Home Use HF Facial Machine 11.0mm. Description The electrodes are gas filled glass tubes of different shapes. The gas inside the tube which is ARGON, glowing violet, conducts electrical current creating electric arch between the end of electrode and the skin which has therapeutic effect. Base diameter - 11mm. Standard. Features: glass electrodes for NewSpa Home use high frequency argon filled (violet) base diameter - 11mm Product Details: Brand: NEW SPA Material: Glass Style: Modern Is Discontinued By Manufacturer ‏ : ‎ No UPC ‏ : ‎ Manufacturer ‏ : ‎ NEW SPA contract manufacturer