Specification:
The brush head is about 2.2-2.8 mm thick. It can be written on any surface: metal, glass, wood, stone, plastic, paper, etc.
Instructions:
1. Shake the pen bar several times before use, and press the pen head vertically down several times until the paint inside the pen seeps out.
2. Vertical use is the best.
3. Cover the pen cover immediately after use