The 3D-40M SD is an alternative needle (replacement needle) that performs identical to the factory needles that are not the original manufacturer made for use with Mitsubishi (Diatone) 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 M.51-40 3D-40M YEL (4951586221609).