Swissstop Brake Pad FlashPro Shimano/SRAM Original Black (set of 4)
The SwissStop Black series pads provide excellent stopping power for aluminum rims, especially softer aluminum rims. The black pads are a great choice for all around performance in both wet and dry conditions.
If you're looking for a more aggressive braking compound the check out the Green GHPII series in the related products in the right column. Or for carbon rims, check out the Yellow series.