What kind of steel is used in the Yubashiri replica blade?

Our Yubashiri replicas are forged from 1045 carbon steel, a medium-carbon alloy widely used in collectible sword making. It contains roughly 0.45% carbon content, which provides a good balance between hardness and resilience. Compared to stainless steel display pieces, 1045 carbon steel has a more authentic weight and can develop a subtle patina over time that many collectors find appealing. The trade-off is that carbon steel requires light maintenance — a wipe-down with choji oil or food-grade mineral oil every couple of months prevents surface oxidation and keeps the finish looking sharp.

How should I care for a manganese steel sword kept on wall display?

The primary maintenance task is preventing surface oxidation, which progresses faster than most collectors expect in homes with central heating or air conditioning, both of which cycle humidity rapidly. Every three to four months, wipe the entire blade surface with a clean cotton cloth and apply a thin, even coat of camellia oil or a dedicated blade preservation oil. Hang the sword horizontally on padded wall brackets rather than vertically with the tip down, which can allow moisture to migrate toward the hilt hardware over time. Do not store the blade inside a leather scabbard for months at a stretch, as untreated leather retains humidity and can initiate pitting even on alloy steels. If you notice the faintest rust bloom beginning to form, address it immediately with a fine polishing cloth and re-oil. Consistent light maintenance is far easier than attempting to restore a blade that has been neglected for years.

Is the blue color on these blades a coating or natural to the steel?

The blue or blue-grey appearance is a natural characteristic of properly polished T10 high-carbon steel - not a painted finish, anodized coating, or chemical treatment. High-carbon steel reflects light differently than stainless or lower-carbon alloys, producing cooler, darker tones across a hand-polished surface. Some blades in this collection also feature controlled heat-bluing on specific sections, which is an authentic traditional finishing technique that creates a stable oxidized layer with a deep blue hue. Either way, the coloration is integral to the steel itself. There is nothing applied over the blade surface that could chip, peel, or degrade the way a painted finish would.

Are these swords full-tang, and why does that matter for collectors?

Updated Mar 2026

Yes - every sword in this collection uses full-tang construction, meaning the steel of the blade extends as a single continuous piece through the entire handle, all the way to the pommel. This is the construction standard that distinguishes serious collectible swords from lower-quality decorative pieces built with partial or rat-tail tangs, where the steel narrows dramatically inside the handle. For a collector, full-tang construction matters for two reasons: it reflects authentic historical manufacturing practice, and it ensures the sword maintains structural integrity during handling, repositioning on a mount, or photographing for a collection catalog. It is simply the correct way to build a sword intended to be taken seriously as a collectible artifact.