This is actually a favorite fidget toy of mine. There is not a puzzle to solve but more a never ending weave of rings that flow over each other. The bright aluminum chainmail rings are loose enough to keep pulling over each other and the weave is such that it will never get to an end. Perfect for those who like to fidget and just have to have something for their hands to do. Measures an inch across (2.5 cm) and is easily washed if needed in regular soap and water.
Obviously not for young children or anyone else this may pose a choking hazard