The Muichiro Sword replicas in this collection are constructed from 1045 carbon steel, which contains approximately 0.45% carbon by weight. This places it in the medium-high carbon range — hard enough to hold a polished edge and maintain structural rigidity for display purposes, yet less brittle than the high-carbon steels used in functional cutting implements. For a display collectible, 1045 carbon steel strikes an ideal balance: it takes a clean surface polish that highlights the blade's geometry, resists light surface oxidation when properly maintained, and gives the finished piece a substantial, authentic weight in hand. It is one of the most commonly specified alloys in quality replica sword production precisely because it performs reliably across a wide range of humidity and temperature conditions typical of indoor display environments.