ROTO GRIP MERCURY Once again, Roto Grip® continues to move to the forefront with the introduction of the all-new Mercurytm. The Mercury is an entry level ball energized by the newly designed Orbiter core. This high RG / low differential weight block delivers increased rev rate in the mid-lane along with smooth continuation down the lane. Encapsulating this new power plant is the always successful Sure Grip IItm pearlized reactive coverstock. This mild reactive blend gives you fluid acceleration through the heads and dependable backend motion through the pins. First of all, it comes to you at a performance price. Roto GripTM has a history of bringing you some of the best performance priced products over the last several years. We pride ourselves in giving you more "bang for the buck" than anyone and this one delivers yet again. Second, we utilize the HeliosTM core found in the original HorizonTM. This single density symmetrical core boasts a lower RG for mid-lane read along with a medium to high Differential for that strong continuation down the lane. That translates into pin shattering carry from any angle. Finally, We surround the powerful core with our most versatile solid coverstock to date Ultimate GripTM. Versatility is the key to this shell. The 800 machine finish gives you all the traction you want in oil as well as superior traction on the backend. Add some polish and you can create more length and even stronger backend motion on those lighter volume patterns.