Prefer the 17g over these, but well see how long the 17g last.

These black strings were a GREAT addition to my new racquet. They were pre strung for me when i recieved my racquet and i am very satisfied with my performance with this new racquet and the quality.

I thought the string was fair. Im still looking for a new string that fits me better.

Ordered these with a new IG radical pro. Shipping was fast, and the stings perform very well. I used 60lb tension and they are working great!

exellent strings but the logo wore off really fast.

Excellent product!!! Congratulations to TennisExpress by the quickly job and shipping!!!

I think it is difficult to rate strings and racquets independent of each other. Im using HEAD Sonic Pro 16G @ 60 lbs in my Extreme Pro 2.0. The poly, of course, makes a spin-friendly racqet even friendlier. The higher tension helps to reign in some of the power of this frame and provides excellent control. I have found that I prefer this setup to the demo I used, which was a hybrid of Sonic Pro and FXP strung around 55 lbs. Some people dont like poly strings at higher tensions because theyre too stiff, but I have no issues with that in this racquet as the Extreme Pro 2.0 does not play nor feel as stiff as its rating may suggest. But, I believe Sonic Pro is one of the softer polys, so it may be different with a different string. In any case, I love the current setup/combination of racquet, string, tension.

OK strings. Used as crosses with Lux ALU Power in mains. Lasted about 2 days.

I really like the feel and comfort of these strings. I typically use RPM Blast but recently switched and have been playing with these for about 3 months now. They provide more spin and are much more comfortable.

The Sonic Pro 16g strings are a really good string. They perform to my expectations, and they have not broken yet. I would recommend these strings to anyone who wants more control and spin.

thanks for all the service and follow up.

At first these strings felt like any other ones, but once I started to play competitively they were very different. These strings gave me alot of control and very good spin and also power. I would recomment these string to players who want control, spin, and power.

The SONIC PRO 16G STRINGS BLACK that I bought with my Head Youtek Radical S racket work as expected and provide ample tension, feel and control for my 3.5 USTA matches.

Excellent feel on ground strokes as well as volleys. Will purchase again soon.

Love the recommended combination of Head Sonic Pro mains and Head FXP for crosses as recommended by your salesperson.