The Comp Master? advance assembly kit is made from a high grade stainless steel so it won't rust. The weights are completely saturated with a specially formulated polymer coating that protects it from heat saturation, reduces friction, strengthens the component and makes it more efficient. The kit includes the center bolt. The Comp Master? advance unit was created to not only upgrade a points style ignition, but also to enhance the early electronic ignitions and to convert electronic ignitions back to the simplicity of a points ignition.