Just upgraded to a newer Mac, and so I'm selling my 2011 13" MacBook Pro. Specs are as follows:

Processor: 2.3 GHz Intel Core i5
Memory: 8 GB 1600 MHz DDR3
Storage: 320 GB SATA
Graphics: Intel HD Graphics 3000 512 MB
Native resolution: 1280 by 800
OS: OS X Yosemite.

Machine is very fast, works fine, looks nice and clean (minor dent/scratches), with a good battery. Charger included.