Tsuba (sword guards) are the most actively traded category — circular or square plates of iron, copper, or precious metals, often pierced (sukashi) or inlaid with gold and silver (zogan). Edo-period schools like Goto, Hamano, Soten, and Ishiguro each developed distinct visual languages. Menuki are small sculptural ornaments fitted under the wrapping on either side of the hilt. They're typically paired and often depict animals, plants, or mythological scenes in cast and chiseled metal. Kozuka are the decorative handles of small utility knives (kogatana) housed in slots on the saya (scabbard). Surviving kozuka are often signed and traded independently of the knife. Fuchi-kashira are paired collar and pommel fittings that anchor the hilt at top and bottom. Matched sets by well-known artists like Yokoya Somin or Goto Mitsutsugu can command prices rivaling fine swords. Many fittings carry NBTHK Hozon or Tokubetsu Hozon certification documenting attribution and quality. Listings on NihontoWatch link back to the original dealer for inquiry and purchase.