A type of link connecting the handles of a nunchaku. Generaly used with a chain link.
often essentual for a smooth flowing routine with chained nunchaku the ball bearing system provides a smooth glide. This means you could spin one handle for a long time without the chain having to uncoid as tension grows which can lead to arratic and unexpected behaviour; as such giving a smoother display and minimalising risk of getting harmed or injured.
the syatem relies on two plates, one connected the the handel and the other connected to the chain. to prevent annoying and counter-productive grinding a series of ball bearings (small metal balls) are places in between meaning the disks simply run off each other. to produce an even smoother flow you can lubricate them using a substance such as WD40, being a sprayable oil.