Write, Delete, Repeat! Erase and rewrite repeatedly without damaging documents. No wear and tear. Thermo-Sensitive Gel ink formula disappears with erasing friction. Available in fine (.07mm) or extra fine (.05mm) point. 3 color set includes Black, Blue and Red. 8 color set includes Black, Blue, Red, Pink, Purple, Orange, Lime and Brown. 6 color set is extra fine point and comes in Black, Blue, Red, Green, Purple, and Pink.