From what I can remember it's an alloy of nickel and titanium, and I think it's used for bendy glasses frames. Google will help you further...
EDIT:
Scroll to the bottom ---> http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway_pre_2011/rocks_metals/4_metals_alloys2.shtml
EDIT:
Scroll to the bottom ---> http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway_pre_2011/rocks_metals/4_metals_alloys2.shtml
(edited 10 years ago)
I remember the same; it is just an alloy made up of nickel and titanium. It's used for spectacle frames 
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