Replacement Front Tubes for ER-3A Insert Earphone – Set of 2 Right (red) and 2 Left (blue) tubes SKU: ER3-21(ABR) Categories: Spare Parts, Spare Parts G1/G2 Related products Cart with Combo Lock System Read more Non-invasive Electrode Ear Tip Cable with Clip-Snap-connector to ER-3A Insert Earphone – Set of Left and Right for Non-invasive Electrocochleography (ECochG) Read more Battery Pack Cradle Assembly Read more Battery Pack Kit (A/C Adapter, Charging Cradle, 2 Battery Packs) Read more