The Alloy models feature the all aluminum drums and end caps that are beautifully machined and perfectly balanced. These are the quietest and smoothest rollers on earth. As the diameter decreases, the resistance increases. 3.0-Inch has 40-Percent more resistance than 4.5-Inch while 2.25-Inch has 90-Percent more resistance than 4.5-Inch. Expires Apr 23, 2013

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