Custom handbuilt moving coil cartridges with the coil of a GRASSHOPPER III and the frontpole and suspension of the GRASSHOPPER IV: the best cartridge available for its price. Production time: The production time for a The FROG ® cartridge after ordering is about two weeks. Version: a) Standard b) Gold c) High Ouput Stylus Replacement Available: see (*1) Stylus Shape: VDH - IS Stylus Radii: 2 x 85 Micron Frequency Range: 5 - 55.000 Hz Tracking Force: 13.5 - 16 mN Static Compliance: 35 Micron/mN Tracking Ability at 15mN at 315Hz: 70 - 80 Micron Output Voltage at 1 kHz at 5.7 cm/s eff.: a) 0.65 mV RMS b) 0.65 mV RMS c) 2.25 mV RMS Channel Unbalance: < 0.3 dB Channel Separation at 1kHz / 10kHz: > 35 / > 30 dB Equivalent Stylus Tip Mass: 0.32 Milligram System Weight: 8.2 Gram Vertical Tracking Angle : 22 Degrees Optimum Load Capacitance: see (*2) Recommended Load Impedance: a) 500 (> 200) Ohm b) 500 (> 200) Ohm c) 47k (> 1k) Ohm Recommended Eff Tone arm Mass: 6 - 10 Gram Moving Coil Resistance per channel: a) 21 Ohm +/- 10% b) 16 Ohm +/- 10% c) 96 Ohm +/- 10%