The classic ROBLOX studs were round, not square. Many users were confused when the transition to round studs and square studs occured. In April 2009, ROBLOX was forced to change the shape of the studs to avoid copyright issues with LEGO. Users who haven't edited their character since before the change still have round studs on their character image, but not in game. If you're looking for the article on studs in general, go here : http://roblox.wikia.com/wiki/Stud.
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