Traditional special electrode for blackening

Don't look around 500 yuan, poles are not expensive, wheels are expensive, and suits with 500 yuan are often broken. And it's not that brands are hard to repair. The pole is about 200, which is uneven and easy to break. It is cost-effective to go to the forum to collect second-hand equipment. Moreover, the black season is coming to an end. Don't worry, take your time.