The DT-59 SD is an alternative needle (replacement needle) that performs identical to the factory needles that are made by the manufacturer for Victors 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 JV.30-59a DT-59 GRN (4951586174127).