 "Apple MacBook Pro - 13.3" Core i5 4 GB RAM 500 HDD English" " Apple English MD101LL/A Notebook Computers CDW.com
"MacBook Pro is machined from a single piece of aluminum, an engineering breakthrough that replaced many parts with just one. It's called the unibody. And the first time you pick up a MacBook Pro, you'll notice the difference it makes. The entire enclosure is thinner and lighter than other notebooks. It looks polished and refined. And it feels strong and durable - perfect for life inside (and outside) your briefcase or backpack." 
 "Apple MacBook Air - 13.3" Core i5 OS X 10.8 Mountain Lion 4 GB RAM " Apple MD231LL/A Notebook Computers CDW.com
"Sure, MacBook Air is unbelievably thin and light. But they also designed it to be powerful, capable, durable, and enjoyable to use, with enough battery life to get you through the day. That's the difference between a notebook that's simply thin and light and one that's so much more." 