Make your own colours, or just complement the existing TwinOne range with your old favourites.
Empty marker with two nibs (chisel and brush) for filling and mixing colours yourself.
The transparent marker without ink filling allows you to see exactly what is happening during the refill process - and after it can be used as usual.
Technical details: Housing and cap made of PP/PE
Brush nib: line width 0.5 - 7 mm
Chisel nib: line width 2 - 6 mm
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I brought these as I work from multiple locations. A really good option to reduce the amount of pens I need to carry around. Two for one option. They do need to be stored horizontally or else the ink settles down one end which leads to the other end running out of ink quickly. I'll definitely buy more in future to build up my colour options.