Our Long Nib Marker contain Solvent, Glyceride, 2-Pyrrolidone. It can adapt to narrow gaps, convenient for you to mark in a small space, and can dry quickly, without leaving traces; And waterproof and moisture-proof, marking color bright and lasting. Its use method is very simple: after ensuring that the marking surface is free of oil and dust, shake the pen body and press the nib to let the ink flow, ensure that the ink runs smoothly, insert the nib into the deep hole or slit to mark the circle, and ensure that the cap is sealed to prevent the ink from drying. Can mark most dry and dust-free surfaces such as aluminum, metal, concrete, glass, wood, plastic.