Artline 5109A Blue Big Nib Whiteboard Marker, 10.0 mm Chisel Tip, EK-5109A 47449. Shachihata Artline Big Nib Whiteboard markers with a jumbo 10.0 mm (3/8") tip are designed to be clearly visible from a distance. They have extremely dense color and are perfect for any presentation. Low odor alcohol based ink is xylene free. Tip is made from polyester fiber. Suitable for use on electronic whiteboards. Refillable with Artline X1A47437 blue refill ink.