Surface mount components are commonly available with gull-wing, J-style and butt-lead configurations. Gull-wing style leads are the most popular design for interconnects. While it can be argued in some cases that a J-style lead offers a better solder fillet, in other cases they offer no technical advantages with connectors and almost always require more complex and expensive stampings. Butt-leads have less surface area than is desirable for good solder fillets, a particular concern with surface mount interconnects. Some tests have shown pull strengths of butt joints at less than half that of gull-wing and J joints. Gull-wing style leads are relatively easy to stamp and form on standard and fine pitches, lend themselves to low profile constructions and have some ability to self-align on the pads during soldering. Depending on the insulator design, all styles allow easy cleaning of boards and visual inspection of solder joints.