The D150 SD is an alternative needle (replacement needle) that performs identical to the factory needles produced by the manufacturer for PICKERING record cartridges. This replacement needle is a "synthetic diamond needle" type. This is a generic model that plays a regular range of sound ranges, with a standard conical shape. General life is about 200 hours. The successor to the PC.174-D15 D-150 BLK (4951586250401).