The PN-15 SD is an alternative needle (replacement needle) that performs identical to the original needles that are made by the manufacturer for Pioneer 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 P.53-15 PN-15 RED (4951586330707).