Hollow Styrofoam Balls?

Answer

Hollow Styrofoam balls are made of polystyrene foam. They are hollow inside, because they are made of 98% air. They are extremely light weight and great for making crafts. Seasonal crafts use Styrofoam balls to produce memorable craft pieces such as Christmas tree ornaments that can be painted. Other crafts such as penguins, spiders, snowmen, and ghosts also use Styrofoam balls. Styrofoam balls can also be used for packing items for shipment or for moving from one place to another.
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