Gary as from the link you presented, i will try to explain my previous post.
Quote:
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Originally Posted by http://www2.usfirst.org/2005comp/2005_Team_Elements_Overview.pdf
"Materials- The materials required to build each element are listed in the link titled “2005 FIRST Robotics Competition Game Team Elements Materials List”. The methods to build team practice versions are described below:"
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Gary as that paper say, the materials that are used to build the objects there are for practice, thus economical items to save costs.
My sources from my previous post is the field that i packed with FIRST from the kickoff for the BAE Regional.