These pens and their case are Amazing.

The Mickyu Fineliner Color Pen Set has met all and surpassed my expectations. The pens themselves work wonderfully for just about everything you would want a colored pen for. I have used them to write simple short notes with a touch of flair and I have used them to color in fine details in a detail-oriented coloring book. They are .4 mm so getting the fine details is easy. The case they come in is also very nice. When pens come in a disposable case I have a tendency to lose them but, the case keeps them nice and even latches closed. I love these!