1. Will not fade when writing, easy washing with water, fades when rubbed by hands.
2. Environmental friendly -- all components are made from pharmaceutical auxiliary materials, meeting food production requirements and safety requirements.
3. Safety -- using water and glycerol as solvent, health and environmental protection.
4. Stability -- smooth writing, not easy to dry, long preservation time.
5. Rich colors -- black, yellow, magenta, cyan, green, purple and other OEM colors.