What pencil techniques are used to create the differences between construction lines and object?

Construction lines are thin lines that serve as guides while sketching or drawing while an object line is a heavy solid line used on a drawing to represent the outline of an object. Pencil techniques are kind of obvious, use a 2H+ pencil to sketch in the construction lines and a 2B+ pencil to sketch the heavier object lines. These are only lines so there is no "technique" to it.