The ultra popular RAD4 core is back and this time it features a brand new cover formula ReX, which is NeX and R2S combined. I drilled mine 5.5 x 5 x 1 and for comparison purposes, I compared it to the Roto Grip RST X-1, which I have also drilled the same way. After throwing the Dark Code, I was quite amazed on how strong this ball was and how much it continued to angle down lane. It is just a couple boards strong than the RST but the shapes of the ball are totally different. The RST is a lot more of a smoother angled shape into the pocket, where the Dark Code you can see the cover dig in and once it makes its motion it doesn’t quit. I can see myself using this ball later in blocks on longer patterns where I still need a strong but angular motion.