The HIFIMAN Aluminum Trim Rings are strong and rigid, which can be fastened inside the headphone cup and used for attaching the ear pads with a mounting ring to them.
Available in Plastic or Aluminium, every ring comes with 6 scows per ring.
They fit all our round headphones such as the HE400S, HE400i, HE560, Sundara etc.
![FiiO uBTR Bluetooth Headphone Amplifier [b-Stock]](https://www.playstereo.com/12920-home_default/fiio-ubtr-bluetooth-headphone-amplifier-b-stock-.jpg)
![FiiO BTR5 Balanced High-Fidelity Bluetooth Amp [b-Stock]](https://www.playstereo.com/16505-home_default/fiio-btr5-balanced-high-fidelity-bluetooth-amp-b-stock-.jpg)
