Dual tip for 33, 45 rpm on one side, and 78 rpm on the other.
- Tetrad Cartridges:  TC12M1 TC12M0
- BSR Cartridges: T2 T3 T20 T30
- Astatic: 1306D 1309D

Genuine Tetrad TC12M0 ceramic cartridge blue socket, 

Brand new condition packaged out of original Tetrad bulk trays.