The 2009 update to the Head MicroGel Extreme Pro offers an eye-catching new cosmetic and a DuPont Teflon grommet system that reduces friction. HEAD's patented technology called MicroGel, deforms and compresses upon ball impact, uniformly absorbing and distributing the impact load around the entire frame, creating a rock-solid feel while offering extra stability against twisting. Ideally suited for players with moderate, powerful strokes. Less friction means maintaining more of the strings energy, and a resulting slight increase in power.