Etymotic Research ER4S microPro Precision Matched Balanced Armature Driver In-Ear Earphones 785422813116 H-Series bearings are narrowed for

H-Series bearings are narrowed for greater crankshaft fillet clearance

Keeps cargo clean and folds flat for easy storage when not in use

Not compatible with '88-'91 D-series intake manifolds Must use Skunk2 Pro Series Intake Manifold or similar

Extra fine point lays down precise

Etymotic Research ER4S microPro Precision Matched Balanced Armature Driver In-Ear Earphones 785422813116 H-Series bearings are narrowed forBrand Etymotic Research Model ER4S Color Black Size N A High performance balanced armature drivers are precision matched to within 1 dB Designed to compensate for the high frequency emphasis in recordings Popular with musicians recording engineers and audiophiles; can be used with a headphone amplifier if desired Braided cables for reduced microphonic effect Includes an assortment of eartips for a comfortable fit and carrying case True high fidelity