Zirconia bar is a rotary bar whose working part is made of zirconia.
 It was developed from the shape of the blade by utilizing the characteristic of zirconia, which is a material that is hard to be charged.
 Therefore, the cutting powder obtained by scraping the resin with a zirconia bar does not carry static electricity and does not cling to it so that it can be lightly blown with air.
 * "Zirconia Bar ®" is a registered trademark of Machine Tool Co., Ltd.