content: Ok so if you read my review on the actual detector, you can see I was not find the old deep coins. In theory, a bigger coil is supposed to add some depth so I flipped for the extra money on this bigger coil and got the same results as the 8" coil. I called Bounty Hunter and their web site mentions nothing about extra depth and said the other places selling these should not be advertising that. There is NO gained depth with this bigger coil. I paid good money for nothing. The point of this coil is to cover more area in less time, however that means you are going too fast and missing targets. If you want it for a gain in depth over the standard coil 8" that comes with unit, do not do it. Do not take my word for it, call Bounty Hunter they will tell you the same thing. I am now stuck with an extra coil and gained nothing. Going to save up and just buy a better detector.