Tsuka-ito refers to the traditional wrapping of the handle, or tsuka, of a Japanese sword, such as a katana. This technique not only enhances grip but also provides a decorative element, often featuring intricate patterns and colors. The wrapping is typically made from cotton or silk, and it is tightly wound to ensure durability and comfort during use. The process of applying tsuka-ito is an important aspect of sword-making and maintenance. It requires skill and precision, as the wrapping must be both functional and aesthetically pleasing. Properly done, tsuka-ito contributes to the overall balance and handling of the sword, making it an essential part of the katana's design.