The ball used in a game of Ping Pong. In Chinese, 'Ping Pang' is the sound of swords clashing - which is what the sound of playing Ping Pong most resembles. These days Ping Pong balls are made of celluloid but originally they were made of a severed goat testicle which had been left to to dry for several days. Modern Chinese ping pong players assert that the new balls have improved the game considerably.