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!