This is an optical drive cable for the 15" Macbook Pro Unibody models. This is the cable that connects the optical drive (superdrive) to the logic board. There are two revisions of this cable depending on the manufacture date. The 2008 and early 2009 models use the 922-8705 cable while the newer mid-2009 models use the 922-9032 cable. If you are unsure which you need, you can click the link below to identify your model and it will give you the manufacture date.