The Swedish Yevo Labs has unveiled a series of wireless headphones that incorporate metal made from seized illegal guns.
The charging case and a band on the headphones themselves are made of branded Humanium material.
It was created by the Humanium Metal Initiative, also based in Sweden, and used by many Scandinavian manufacturers.
An analyst said the idea should help the headset stand out in a now saturated market.
Yevo headphones
The CEO of Yevo, Andreas Vural, acknowledged that the US $ 499 (£ 370) price was "high", but the 50% would be returned to the organization that creates and distributes the metal.
Headphones work using NFMI (near-field magnetic induction) technology rather than cables, in addition to Bluetooth.
NFMI has long been used in pacemakers and hearing aids because its low-frequency magnetic field leads through the liquid, even inside the body.
"Obviously you want the headphones to be good? Then you will have to pay for the new material, "said Stuart Miles, founder of the Pocket-lint gadget review site.
"What you find is that there are so many headphone manufacturers out there, to stand out from the crowd everyone tries to do different things.
"In the same way Apple does with its Red products - sales money goes to support people living with HIV around the world - Yevo is trying to show that they believe in a cause."
Other audio products on show at the CES tech show also boast the use of recycled materials.
They include the UK House of Marley, which uses a fabric made from recycled materials for its headphones and Armor 3D, which shows a Bluetooth speaker whose case is made of recycled plastic.