It is also really practical as it works brilliantly. These are just fantastic. It holds a great charge. I am 70 yrs old and my foot type requires a neutral shoe for my daily +2 mile walks. The case itself is firm and thick. I put a piece of moleskin on them and had a no problems since. For £30 I expected a hell of a lot longer life than this. Which leads me to ask. Will continue to purchase this product. A variety of hex keys are needed for installation and you will need both metric and imperial.