Nihontō Care Mat — Gassan Sadatoshi, bearing the smith’s own calligraphy “百錬製鉄 (Hyakuren Seitetsu)”

A full-length microfiber care mat carrying a motto brushed by one of Japan’s foremost modern swordsmiths

This is more than a maintenance mat. It is a tribute to the swordsmith Gassan Sadatoshi (月山貞利), printed with Hyakuren Seitetsu (百錬製鉄) — a motto the smith brushed in his own hand. At 195 cm (approx. 76.8 in) long, it lays out a complete katana during care, giving your iaitō (practice sword), shinken (live blade), or shinai a resting place on a surface that honors the tradition it serves.

The calligraphy — “百錬製鉄 (Hyakuren Seitetsu)”

Hyakuren Seitetsu may be read as “steel refined through a hundred temperings” — iron folded and forged again and again until it becomes a blade. It is not a stock slogan but the smith’s own words, in the smith’s own hand, and it names the very heart of the Gassan craft.

On the smith — Gassan Sadatoshi (月山貞利), b. 1946

Gassan Sadatoshi (real name Gassan Kiyoshi) carries one of Japan’s oldest swordmaking lineages. Born in Osaka in 1946, he is the third son of Gassan Sadakazu (月山貞一), a Living National Treasure, and succeeded to the Gassan line in 1969. The Osaka Gassan school is famed above all for ayasugi-hada — a flowing, cedar-grain pattern in the steel found almost nowhere else. He received the Takamatsu-no-miya Prize at the New Sword Exhibition in 1975 and was recognized as mukansa (無鑑査, “exempt from examination” — the highest standing a living smith can hold) in 1982, at the age of 36. His blades are held in the collections of the Museum of Fine Arts, Boston, and the Metropolitan Museum of Art, New York.

Fit and use

Measuring 195 × 25 cm (approx. 76.8 × 9.8 in), the mat comfortably holds a full katana: a blade of up to about 2.45 shaku (approx. 74 cm / 29.2 in) sits perfectly within it, while a 2.5-shaku blade (approx. 75.8 cm) rests with the handle just past the end. The soft microfiber surface gives the saya (scabbard) and the steel a clean place to rest and will not scratch them while you oil and wipe. At roughly 1 mm thick and only 82 g (approx. 2.9 oz), it folds flat and travels easily to the dōjō, an exhibition, or a fellow collector’s. It has no non-slip backing, so use it on a flat, stable surface.

Caring for the mat

Wash with a mild, neutral detergent (or a microfiber-specific one). Avoid fabric softener, which clogs the fibers and lowers absorbency, and avoid bleach and optical brighteners, which damage them. Hand washing is gentlest: use lukewarm water (about 30–40 °C / 86–104 °F), press or knead gently, then rinse thoroughly. If machine washing, place the mat in a laundry net and wash it on its own — or on a gentle/hand-wash cycle — to keep lint from cotton items off the print. Being a polyester/nylon microfiber, it is sensitive to heat: do not tumble-dry, iron, or sterilize it in boiling water. Hang it to dry in a well-ventilated, shaded spot, away from direct sunlight, which can stiffen the fibers over time.

One of a four-smith tribute series, each mat dedicated to a master swordsmith and carrying his own brushed motto. Choose the smith whose work speaks to you — or collect the series.

Specifications

• Type: Nihontō care mat (microfiber)
• Design: 百錬製鉄 (Hyakuren Seitetsu), brushed by Gassan Sadatoshi — black ground with sword print; white reverse
• Size: 195 × 25 cm (approx. 76.8 × 9.8 in)
• Thickness: approx. 1 mm
• Weight: approx. 82 g (approx. 2.9 oz)
• Material: microfiber (polyester / nylon)
• Fits: blades up to approx. 2.45 shaku (approx. 74 cm / 29.2 in); a 2.5-shaku blade sits with the handle slightly past the end
• Backing / non-slip: none — use on a flat surface
• Care: hand wash, or gentle machine wash in a net, with mild detergent; no softener, bleach, tumble-drying, or ironing; hang to dry in the shade (see “Caring for the mat”)