the Rega Heavy Tungsten Counterweight makes installing heavy cartridges on your RB-300 or higher tonearm a breeze. Substantially heavier than the stock counterweights, we have yet to find a cartridge the Heavy Tungsten Counterweight can't tame.
The denser weight allows for closer positioning of the weight to the pivot and reduces the vertical moment of inertia of the arm, allowing it to track warps more evenly while still balancing the weight of the cart.
Having the weight closer to the pivot also alters the resonant frequency of the whole arm, increasing the frequency due to effectively decreasing the compliance of the arm stub and weight assembly.
The Rega Extra Heavy Tungsten counterweight is for the cases where the cartridge chosen is too heavy to balance properly with the standard weight. Some people also like to use this even if they cartridge isn't too heavy as they like the effect created by moving the counterweight closer to the bearing pivot. The Rega Extra Heavy Tungsten counterweight works with the RB303 and the RB300/301/330/600/700 tonearms.
diameter: 34mm (13.38")
wieght: 120 g ( .264 lbs)