Parts Express B4D C3D K1D Tetrad Type Replacement Stylus Needle Replaces TETRAD 23D,23S, 43D, 43S, T2MD, T3MD Used in TERAD6-23D, 2-43D, 3-43S, 3-43D, ADM, 409C785, 6 6; VM37635C Tip Material: Diamond and synthetic sapphire Tip radius: .0007 x .0007; Speeds: 16, 33 &amp; 45 RPM Manufactured in the U.S.A.