How to change the density of a demo model?

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lovematlab
lovematlab 2017-3-7
Hi, I am trying to understand a SimMechanics demo. When the demo is loaded, a .m file which stores the values for some parameters are loaded. There is a section at the top of the file which defines the Material Properties. It states: density = simmechanics.demohelpers.densities;
When I double clicked a Solid in the model, under Inertia it states that it is based on the Density and the Density is rho. I cannot find rho being defined in the .m file.
Please let me know how to change the density to aluminum.

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