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.
diameter: 34mm (13.38")
wieght: 120 g ( .264 lbs)