This is a bottom case assembly for the MacBook 13". This is a WHITE bottom case. There are two versions of this bottom case. 922-7896 is for the original core Duo and Core 2 Duo Macbooks that have the apple symbol on the command key (the key next to the spacebar.) 922-8285 is for the Santa Rosa Macbooks that do not have the apple symbol on the command key. The 922-8911 is for the Penryn model manufactured in early 2008.