gnarlsagan
Headphoneus Supremus
- Joined
- Sep 11, 2011
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To be honest, i am not very sure what those seem to be.
Sorry.
Fourth one down, the description is: "
Speakers & Transducers Plug 2.08 dia. 2200 Res, Red"
Those are the red filters that go in the end of the barrel of the ER4. Stock filters are green.