RHA T20 (Discontinued by Manufacturer) No longer produced by RHA, replaced by newer model: Gen. 2 RHA's revolutionary Hi-Res DualCoil Dynamic Drivers produce audiophile-quality audio Injection moulded 303F premium grade Stainless Steel ergonomic housings with patent pending, mouldable over-ear hooks for supreme comfort. Interchangeable tuning filters. Bass (Effective Max +3dB below 200Hz)