Replacement Front Tubes for ER-3A Insert Earphone – Set of 2 Right (red) and 2 Left (blue) tubes$20.00 Replacement Front Tubes for ER-3A Insert Earphone - Set of 2 Right (red) and 2 Left (blue) tubes quantity Add to cart SKU: ER3-21(ABR) Categories: Spare Parts, Spare Parts G1/G2 Related products Battery Packs x 2 $175.00 Add to cart Battery Pack A/C Wall Adapter $175.00 Add to cart B-71 Elastic Headband – for B-71 Bone Conductor $10.00 Add to cart Non-invasive Electrocochleography (ECochG) Kit: ER3-60 Electrode Eartip Cable with Clip-Snap and Starter Gold-foiled Ear Tip Set – 20 pcs. ER3-26A (13 mm) and 20 pcs. ER3-26B (10 mm) $320.00 Add to cart