This ZEBRA Clip-on Multi pen may seem a tad expensive at $15.90 but consider this:
It not only can write in 4 different colors (black, blue, red and green), it also has a inbuilt mechanical pencil (nudge down the clip-on and out comes the pencil) – and also a nice little capped eraser at the top.
This Japanese innovation is enough to convince me to buy it, after I’ve checked with the store that they also sell the re-fillable inks.
To me, this is a sustainable product. Not only does it makes life easier for the consumer , it also cuts down on the materials needed to produce 5 different pens and pencil. What is more, any ink that is used out can be replaced with re-fillables.