The official rules of Table Tennis state that the ball shall be:
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Billiard balls are typically made of phenolic resin or polyester resin. These materials are durable, have a high density for consistent play, and resist chipping and cracking. Some lower quality balls may be made of acrylic or other plastics.
They're usually made of a plastic resin.
Identical twins look the same on the outside but have different fingerprints. Similarly, billiard balls may have the same color and size but have different internal composition, such as being made of different materials.
A billiard ball.
balls
John Dalton imagined atoms to be indivisible and solid spheres that were akin to billiard balls. He believed that atoms of different elements had different sizes and weights, and that they combined in simple whole number ratios to form compounds.