These surfacemount heatsinks are extruded not stamped. These extruded designs are far more efficient than any stamped counterpart. One of the main issues is getting heat from the board level into the heatsink. The extrusion allows for large pads and a direct thermal path from the board and into the heatsink. The ability to get the heat off the board coupled with its large surface area yields a surfacemount heatsink unmatched in the market.