"just got our custom @ultimateears in!! now hopefully we won't be deaf in 5 years" Krewella tweets about their customized black and red Ultimate Ears In-Ear Monitors.
Listed on http://www.metallica.com/band/band-bio-gear.asp
As can be seen at his official Instagram account (about making some music) you can see him using this item in the picture / video.
Ultimate Ears Custom
Artist touts using Ultimate Ears IEMs on website.
Tim uses UE-18Pro custom In-Ear Monitors for live shows to save his hearing and eliminate feedback from stage monitors when he sings.
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