It's exactly the same stuff. Trophy Rock is about $15 a 12 lb rock or the Four65 is $15 for a 30 lb bag. Your call. Either way, you are still over 90% salt. I bought a bag of the Four65 and added in some leftover Bullseye12 mineral mix I bought locally from a feed store. The mineral and salt ratios are about what Mojotex posted, but without the work and hassle of mixing. I just put it out last weekend to see how it goes. I mixed about 15-20 lbs of the mineral to the bag of trophy rock four65. The salty brings them in and the minerals are there for the licking. I haven't checked game cameras yet, but have seen hoofmarks in the dirt where I put it out when I was working food plots last night.