The N44-7X SD is an alternative needle (replacement needles) that performs identical to the original factory needles that are made by the manufacturer for SHURE 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 SH.192-44-7X N-44-7X WHT (4951586271956).