It says here that the shutters on the windows of the International Space Station are made of aluminium. They've used it because it's strong yet light, which is quite important when you're being assailed by lumps of space debris - and almost as important when you're listening to I'm a Gummy Bear on the bus.
Allow us, then, to introduce the NuForce BE6i wireless in-ear headphones from Optoma. These Bluetooth beauties are crafted from aluminium to give you clear sound in a robust but elegant lightweight design. They can play music and take phone calls continuously for up to 8hrs and have an inline remote that can skip tracks, engage Siri and activate Bluetooth pairing.
What's more, they have a 30m range and have been IPX5 certified for protection from rain and sweat... but not space debris, sorry. Find out more at optoma.co.uk/sound
So to be in with a chance of winning simply follow this link and answer the question.
Hurry! This competition closes on 8 June 2017