Rondo has a pleasantly soft, rubberized surface for the best writing comfort and has become a favourite for many. 
This model of Rondo comes with erasable ink. The ink is heat-sensitive and can therefore be invisible with help from the extremely durable built-in silicone eraser. By putting the paper in the freezer the text will appear again. The inks are in the same colour as the pen: black, blue, pink and green. 
Ballograf has a life-long warranty on the push mechanism.  
Tip: Medium
Ink Colour: Black, Blue, Pink, Green