Sennheiser will soon be launching its new IE 600 in-ear headphones, and most interestingly they’re built from a metal called ZR01 amorphous zirconium. If that sounds premium and sturdy to you, that’s because it is – it’s the same metal that was also used for the drilling head of NASA’s Mars Rover. As reported by What Hi-Fi? (opens in new tab), the Sennheiser IE 600 will act as a sort of halfway house between the brand’s more affordable IE 300 and its super-premium IE 900 in-ear headphones.
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