Transponder Key Blank Fits Cadillac CTS With Do It Yourself Programming Instructions This is about one uncut transponder key blank with a black plastic head, and the chip included inside the key, tested and ready to be programmed. You can take it to most hardware stores, home improvement centers, or locksmith shops with your working key to cut it and duplicate it. Once you get this new key cut, you can program it yourself. All you need to have is one working key that starts your vehicle. The programming procedure is very easy to follow step by step, and is included with the key. Any question you have, you can always contact us. We stand by our products, and they are guaranteed to work. It Fits 2008 2009 2010 2011 2012 2013 Cadillac CTS