Hi,
Thank you for the response! Yes it is a site built using WordPress and WooCommerce. I will be using canonical URLs, but am not sure how to best go about creating product description for different variations of the phones. Here is a perfect example of the situation I am running into.
http://buy.gazelle.com/buy/used/iphone-5-16gb-at-t
http://buy.gazelle.com/buy/used/iphone-5-32gb-at-t
These two URL are to two separate product pages. The only difference in these two phones is that one is 16gb and the other is 32gb. If you look at the "Key Features" section, you'll notice duplicate content because each phones has pretty much the same features.
Am I better off trying to write difference product descriptions for each variation of phone using different verbiage or stop the crawlers from indexing that section of the page?