From the product description, check product page for current description, price and availability:

These genuine balls are individually prepared to mount directly on your beer faucet’s thread. Each ball is full size and weight – 2.25 inches and 6oz. These balls provide an attractive and interesting point of difference for your home kegorator or portable set up. They give a satisfying weight and feel to the tap’s operation and I have even been told the extra weight on the faucet’s back angled shut position has stopped some annoying drips I’ve done my best to photograph the balls in their correct color and photos have not been touched up at all.

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