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http://RockTumbler.com Ceramic and plastic media are used as a filler and as a cushioning agent in rock tumbling.
Large ceramic media are used as a filler when you don’t have enough rock to fill the tumbler barrel to proper capacity (2/3 to 3/4 full).
Small ceramic media are used to fill the spaces between large pieces of rock. They cushion the rock from impact and increase the number of contact points where grinding or polishing occurs.
Plastic media is soft and is used as a cushioning agent.
Read a detailed article on selecting rock tumbler media at RockTumbler.com.