According to one aspect, an apparatus includes a substrate, a conductor, and a contact pad. The substrate has a first edge, and the conductor is formed on the substrate. The contact pad has a first end and a second end, and is formed on the substrate and connected to the conductor at the first end. The contact pad has a non-uniform configuration, the non-uniform configuration including a first width and a second width, the first width and the second width being measured with respect to a common axis, the first width being wider than a second width, the second width being a width of the contact pad at the second end, the second end being coincident with the first edge.