Using these Gemfan propellers is easy. First, make sure your drone motor matches the recommended motor (0703 - 1103). Then, carefully attach the CW and CCW propellers to the correct motor positions on your micro drone. When flying, enjoy the great thrust and fast acceleration these propellers provide. As for maintenance, after each flight, check the propellers for any signs of damage like cracks or chips. If you find any, it's best to replace the propeller right away. Keep the propellers clean by gently wiping them with a soft cloth. Store them in a safe place to avoid any accidental damage. And always remember to follow local drone flying rules and regulations.