Brushless Whoop FC Damper

I couldn't find the flight controller dampeners easily available so decided to make my own. These are approximately 4.5 mm x 4.5 mm with a 2 mm ID. They work for the US/UK65 frames as well as the BetaFPV 65X frame. I am unsure but they may work for other frames.

These appear to provide more stable flight characteristics to my brushless.