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Dear Alissa,

PITSCO (www.pitsco.com) has a number of different types of wheels.  We
have used them for our gravity cars, balloon cars, and mousetrap cars.  

http://shop.pitsco.com/store/default.aspx?KeyWords=wheels&searchtype=0&s
port=3&by=20&c=0&t=0&l=0 


Robert McGuire
Director of Educational & Public Programs
Sci-Port: LOUISIANA's Science Center
820 Clyde Fant Pky.
Shreveport La 71101
www.sciport.org 
318-424-8714

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