shinken of swords is focus on Japanese swords made, all Shirasaya of Shinken swords are made of high carbon steel , folded steel, L6 steel, T10 steel , etc. They are full hand polished and hand sharpened. All katanas come with full tang blade. Shinken of swords katanas are strong enough to cut bamboo tree and iron wire, yet sharp enough to slice paper.
A shirasaya, literally "white scabbard", is a plain wooden Japanese blade mount consisting of a saya (scabbard) and tsuka (hilt), traditionally made of nurizaya wood and used when a blade was not expected to see use for some time and needed to be stored. They were externally featureless save for the needed mekugi-ana to secure the nakago(tang), though sometimes sayagaki (blade information) was also present. The need for specialized storage is because prolonged koshirae mounting harmed the blade, owing to factors such as the lacquered wood retaining moisture and encouraging corrosion.