Happymodel Mobula7 Crazybee F3 Crazybee F4 Flight Controller Spare Parts Rubber Damping Balls with M1.2x7mm Screws HP309

Happymodel Mobula7 Crazybee F3 Crazybee F4 Flight Controller Spare Parts Rubber Damping Balls with M1.2x7mm Screws HP309

The short rubber damping ball used for the front, the long rubber damping ball used for back in order to keep the flight controller from loosening when plug or unplug the USB

Specification:
Brand Name: Happymodel
Item Name: Rubber Damping Balls & Screws 

Package Included:
3 x Long Rubber Damping Balls
1 x Short Rubber Damping Ball
4 x M1.2x7mm Screws