1.    Tracking Tape   To correct the Center of Gravity (C.G) point, you’ll be using tracking tape to add the needed weight to your blades. 2.    Black Marker   The marker will be used to mark the Center Of Gravity (C.G.) point for each blade. 3.    Triangle Ruler   The triangular ruler is good because it has a flat side which will let you lay the ruler nicely on any flat surface like a table. 4. Blade holder bolt 5. Heavy duty string or ribbon: As for the heavy duty string, you can buy it at your local hardware store and the ribbon you easily get at your local gift shop. With the above three items you can easily and cheaply balance your RC helicopter blades. You can purchase the ruler and the marker at your office supply store. The tracking tape can be purchase at your local hobby shop. One more thing I wanted to mention, when you get more into RC helicopters you may want to purchase a blade balancer tool to add to your home workshop. Doesn't matter which kind of balancer you get, so long as it allows you to balance both static and dynamic. But for now, the three items above will work just fine.  Instead of the tracking tape, you can also use some clear duct tape. You can purchase the duct tape at your local hardware store. Instead of the tracking tape, you can also use some clear duct tape. You can purchase the duct tape at your local hardware store.