piano wire 
noun [mass noun]
Strong steel wire used for piano strings.He held a snapped piece of piano wire in each of his hands, which he threw promptly to either side....
- Researchers have successfully made and 'tuned' the world's smallest piano wire. The wires are made of carbon nanotubes that measure approximately 2 nanometers in diameter.
- Wire rod is used in automotive components making and tyre manufacturing as well as for products such as bed springs and piano wire.
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