The N-25 SD is an alternative needle (replacement needle) that performs identical to the original factory needles that are used for KENWOOD (TRIO) 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 TR.55-25 N-25 GRY (4951586453208).