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This is called a ball chain, and is also known as a bead chain. There are two types that look very similar but have different advantages:

  • metal ball chain - This is made of hollow metal balls with wire links between. Each ball and link is free to rotate making the chain resistant to kinking.
  • plastic bead "chain": This is made of plastic solid balls moulded at regular spacings along a length of string so is not really a chain. It is not as strong as the metal chain, but can come in a wide range of colours, and is cheaper.
Ball chains are commonly used as lanyards or cords (for example on pens, keys), pull-cords, sink plug chains, and can also be used as a pull chain on a cog as the balls can fit neatly into the cogs. They are used in this way to operate some roller blinds.
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