The material is very pleasant, flexible with very good adhesion for smooth reins. By cons I had no idea of the width I had to take and I took the 13mm which are really too thin to use them as normal reins. So I advise to take the 16mm for normal use, and to reserve the 13mm for the use of bridle reins for example.
Finally if I had to find a defect I would say that the black is matt and is almost a little gray, so it does not go perfectly with the black leather of my net.