Sumiko - Oyster MM Cartridge The Oyster, with its bonded spherical stylus and rugged generator assembly, is for those seeking the most cost- effective moving magnet cartridge to use in the widest applications. Ideal for use in the vast array of entry-level performance turntables and flexible enough to play 45 and 78 rpm recordings with excellent results, the Oyster is a perfect choice High performance at a reasonable price Frequency Response: 30Hz - 20kHz. Output Voltage: 4.0 mV. Load Impedance: 47k ohms. Channel Seperation: 25dB at 1kHz, Channel Balance: 1.0 at 1kHz Stylus Type: Spherical. Compliance: 12 x 10 -6 cm/dyne. Tracking Force Range: 1.5 - 2.5 grams. Recommended Force: 2.3 grams. Cartridge Weight: 5.3 grams.