Markers giant size for flipcharts: large chisel, extra bold point
Amazon.com : Staedtler flipchart marker Lumocolor, wedge point approx. 2 or 5 mm line width, set of 6 colours, ideal for flipchart pads, colour intensive, low odour, Made in Germany, 356 B WP6 : Office Products
Sharpie Flip Chart Markers 8 Pk Bullet Tip Assorted Colors - The School Box Inc