Description: Material: Aluminium Alloy Size:18.5*18.5*5mm Weight: 1.7g Features: 1. Effectively reduce the operating heat of the transmitter, entend its using life. 2. It is suitable for 5.8G TS5823 5828 Aomway Foxeer Transmitters etc. Package included: 5 x HSK Aluminium Alloy Heat Sink