Regulating bodies such as the USBC maintain requirements for the properties of bowling balls, including size, hardness, and number of holes, as well as maintaining a list of bowling balls approved for competitive play.
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The USBC and FIQ specifies that bowling balls may only be made from uniform, solid materials with a density less than or equal to 3.80 g/mL.
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Materials and fabrication changes have since allowed the assembly of balls whose interior components have a much greater range of density, thereby offering a new ball choice that, in physics terms, involves the moment of inertia of a solid sphere.
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Zara's nan bought her a bowling ball for Christmas that year and a Pro Shop operator recommended that she join the Youth Bowling Club so she went along on a Saturday morning and the rest is was set in stone
A 1956 Scrooge McDuck comic by Carl Barks, Land Beneath the Ground!, introduced "Terries" and "Fermies", creatures who move from place to place by rolling like a bowling ball.