If you are in the market for what are knife sharpeners made of, there are many different types on the market. You want to make sure you purchase something that is made of quality steel. When looking for a product like this, it is important to make sure that it is lightweight so you can carry it easily and not get tired while using it. You will also want to make sure that the sharpener is adjustable so that you can make it as sharp or as thin as you would like.
Something else you will want to look at is how much use the sharpener will get. There are some models that will sharpen a single knife, but others will need to be used multiple times for each type of knife. The best way to determine how often you will be using it is to test it out yourself. You should test out several different models until you find one that works well for you. You should be able to test it out at different points during the day and see how long each sharpens the knife for you.
Another thing to look for when looking at what are knife sharpeners made of is how strong it is. It is important that you have something that will last you many uses without having to be replaced. The last thing you want to do is have something break after only a few uses. You will also want to make sure it locks securely in place so you do not accidentally cut yourself when trying to change the blade.