The N-210C SD is an alternative needle (replacement needle) that performs identical to the original factory needles that are used for Toshiba (Aurex) 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 TO.37-210 N-210C RED (4951586433002).