BW&reg; Carbon Fiber Magnetic Prop Propeller Balancer for Multirotor Quadcopter FPV Helicopter Airplane Made of Carbon Fiber and metal Maglev-way to ensure propeller balance with zero friction It is a essential tool for your propellers Net weight: 35g/1.2oz Suitable for any size and less than 80 grams of fixed-wing propeller, marine propeller, car wheels, turbine blades, flywheels, etc.