Japanese Katana, The Traditional Handmade Full Tang Katana are Available in 1060 Carbon Steel, Damascus Folding Steel, T10 Steel and Hardyfield Steel (Cloud-dragon-1060) : Sports & Outdoors
Why are samurai swords folded? - Quora
Demystifying the Authentic Samurai Sword
File:Katana hardened edge pic with inset of nioi.JPG - Wikimedia Commons