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which in the long term can lead to concentration problems
Replaceable cushions with "snap-in" system
you can still keep talking to your workmate
Smaller profile to fit smaller ear canals better
ER4XR Extended Response Earphone Type_Ear Plugs which in the long termER4XR is the highest performing single driver in ear monitor. The IEM shells are made of anodized aluminum, CNC machined with extremely tight tolerances. Using a single Balanced Armature (BA) driver allows for extremely accurate IEM without the added complexity of crossovers, and helps keep the aluminum body small and slim. The included high quality user replaceable cable is reinforced and twisted, to improve longevity and durability. Etymotic IEMs