A-Bar styles / design / effeciency / purpose

Armature bars can come in a multitude of shapes and sizes as
well. Some will have notches or holes drilled in them while others
might resemble the shape of the number 8. These shapes
and designs are to modify the weight and surface area that is
in direct relativity to the magnetic cores. You will have to experiment
with the different types of armature bars to see the different
effect you can achieve. Experiment with metals, shapes, and
lengths since each individual artist has their own preference.