Product Description • 2 colors of ink in 1 pen, convenient to use. • Contrasted color, able to read far from the board. • Dry erasable. • Smooth inkflow. • Suitable to use in classroom and office. Length : 161 mm x Φ14.5mm Nib : Bullet Nib Writing Width: 2.0mm Ink: Alcohol Base, Pigment Color: Black/Red/Blue/Green