The Surujin or Suruchin is of of the tradional weapons of Okinawan Kobudo. It comprises a 2-3 meter long rope with a weight tied to each end. Historically used by fishermen to allow them to pull their boats in where they might not be able to paddle, the word suru refers to the hemp rope originally used, as this material is rot- and mold-resistant in marine environments, and jin (or chin) refers to a weight as used to hold down rice paper while writing.