What does Viz type mean when talking about bowling balls?

at www.Bowlingball.com the balls listed have descriptions which include viz type and performance. Viz type is either viz or non-viz.

Viz is used in the term Viz-a-ball which means it’s a "plastic" spare ball which has an image on the inside of the ball with a clear exterior. This way the image is not damaged by being on the surface of the ball.

Hope this helps.

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