This is a pack of 4 Pentel Maxiflo Marker Pens plus an eraser which is designed for whiteboard use. Dry wipe Pentel whiteboard pen ink can be erased easily from any whiteboard using a cloth or the whiteboard sponge eraser included in this pack. Black, blue, red, and green pens are included in this pack of 4 pens. Featuring a special \'maxiflo\' liquid ink system, this Pentel pen provides a fresh supply of ink right to the last drop. There\'s also a handy visible ink reservoir, and a unique push button operation. The eraser has a convenient whiteboard attachment clip, so you\'ll never lose it.The Pentel Maxiflo Marker Pen is ideal for use on whiteboards in the office, training rooms, and in schools. . Pack of 4 . 2.5mm line width