These are poor quality tools with some signs of mold but I don't make a living changing bike tires so they should keep me good. If you race or ride extreme bikes, you might need something better. They are made of cast steel and are great for people who like to drive and don't wear out the tires often. They are exactly what I need for my bike. I'll change a tire every year or two, so I don't need anything better for my application.