Very Small RBS

Description
 
3.3 w x 4.1 d x 1.7 h in cm |

This is a very small RBS. The ball was supposed to be attached to the top and to the side but the stick that attached it was so small it disappeared with printing. The rest of the sculpture arrived OK. I found the ball rolling around the bottom of the box. Hey, it works, though! Yea! See the video! http://www.youtube.com/watch?v=KGdUFg_X8mE

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I'm asking because I'm making a similar project and was wondering how small i can make the ball so that it still has enough mass to roll on a not very steep slope.
Why do you ask? The ball provided is the right size and weight for this sculpture and need not be substituted. Other than that, please refer to the quarter in the picture to get an estimate of the ball's size.
what are the ball's dimensions here?
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