The D-400 SD is an alternative needle (replacement needle) that performs identical to the OEM needles for use with PHILIPS 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 PH.173-400 D-400 GRY (4951586240006).