A plastic chain can be a remarkably useful tool for a variety of different circumstances.  They can be used for anything from marking a garden area, guiding a crowd in the right direction, or even as a plaything for a bird.  The uses are practically limitless, and the plastic chain link is bound to work for you, whatever your needs may be.  The only real limitation is determining what you need the plastic chains for, and how best to utilize the plastic chains for your specific purpose.