The Surujin (スルジン) is a unique weapon found in Okinawan Kobudō. It consists of a long rope with weights attached to each end. Traditionally, these weights were made of metal or stone, but modern training surujin often use softer materials like rubber or cloth.  

The surujin is a versatile weapon that can be used for striking, entangling, and trapping opponents. It requires precise timing, coordination, and a strong understanding of its mechanics. Techniques with the surujin often involve intricate spinning and whipping motions, making it a visually impressive and challenging weapon to master.  

While the surujin is not as widely practiced as other Kobudō weapons like the bo or sai, it remains a fascinating and historically significant part of Okinawan martial arts.