Using these HQProp Duct T90MMX3 propellers is easy. First, make sure your Cinewhoop drone is powered off. Then, carefully attach the CW and CCW propellers to the appropriate motor mounts. Be gentle to avoid any damage. When flying, keep in mind that these propellers are lightweight, so they may be affected by strong winds. It's best to fly in calm conditions. For maintenance, after each flight, check the propellers for any signs of wear or damage. If you notice any cracks or chips, replace the propellers immediately. Store the propellers in a safe place away from sharp objects to prevent scratches. With proper use and care, these propellers will serve you well for a long time.