These silicone based vibration bobbins are more effectively reducing the vibrations found in multi-rotor applications compared to rubber vibration mounts. A middle ground between rubber vibration bobbins and soft silicone gel bobbins, these bobbins are responsible for the vibration free video performance of the QAV500 quadcopter kit. The kit includes 4 bobbins and 8 M3 nuts (not lock-nuts). Take care not to twist the bobbins during assembly or to put excessive shear forces on them. Use these bobbins in compression applications.