Stainless steel is progressively staying used as it will remain sharper longer and resist rust and corrosion. Different types of skates can have different blades as is instantly apparent when investigating figure skates vs. hockey skates for example. Nobody understands who invented the first ice skates, nevertheless the best theory https://tedomarket.com/product/men/skate-street/original-professional-inline-skates-for-adult-kid-freestyle-racing-rs6-x9-slalom-slide-free-skating-brush-street-patines/