Centon 1gb PC2-5300 200pin SODIMM DDR2 memory stick for mackbook and macbook pros. Like new, cut opened to send in rebate. I originally got it because I had a macbook for a week and so I wanted to upgrade to 2gb. I swapped out for a macbook pro and only needed one of the module. I have original receipt if you need it. Purchased it for 149.99. I will sell for $94 shipped.