I have 7 shavers Mastro and another that will come 'soon. Some are made of stainless steel, and some carbon. They are all amazing but I'll recommend the stainless steel RWL34 'cause it's an invention of the Master who has developed a very sweet and deep and steel that does not rust. If you ask him is his favorite steel. I have 3 in the RWL34, they are fantastic!