These pieces are produced and sold as collectibles and display replicas, not as sharpened tools. The 1045 carbon steel used is mechanically capable of taking an edge, but the blades are left unsharpened from the factory. This is intentional — it keeps the pieces compliant for display, cosplay, and convention use, and it protects the decorative finishes, fittings, and lacquered saya from the stress associated with functional edge work. Collectors focused on display presentation will find the unsharpened finish entirely appropriate for wall mounts and display cases.