The Black board is recommended. Help. Resistant to water and rain to flow. Wipe off with water. ● Store bulletins, chalkboard burakkubo-doma-ka- ● type: Fine Point (round core ● Leads ● Width: 1.8 ~ 2.5 mm Color: White Chalk chalkboard can be used either for a water-based pigment ink * Not Included. * * Body Length: 142.0 mm * Shaft Diameter: 18.2 mm.