My daughter is 11 and is a competitive player. She is medium height/thin, but strong, and hits relatively hard for her age. She plays with a Yonex Vcore 100L racket (strungweight 298g). She hurt her arm about a year ago, so I have since had her playing with a full bed of multifilament strung at 43-44 lbs. I tried the Yonex Rexis Comfort (she breaks it after 6-8 hrs) and the Wilson Sensation (breaks it after about 10 hours). Because she hits hard and has hurt her arm in the past, I have been reluctant even to try a soft-poly/multifilament mix. Does anyone have any thoughts on string (how she could get a bit more durability without risking injury)? Thanks
I've been coaching high school teams for almost 20 years and I've also been stringing for the kids for a long time. I agree with our pals that an 11-year-old shouldn't be using poly or poly hybrids. But the good news is that you've definitely got some options to try.
I generally stay away from premium multis because they're pretty expensive for what they have to offer. The multi I keep on hand for when somebody wants that string type in their racquet is Prince Premier Control (PPC). This string isn't as pricey as others like Wilson NXT, Tecnifibre Biphase, or even Yonex Rexis, and it does a better than average job of holding tension.
A few years ago when the #1 boy on our team was dealing with a steadily worsening case of golfer's elbow in the chilly spring season, we switched him away from his full bed of poly (RPM Blast - overpriced garbage string) into full beds of PPC 16 ga. He started feeling better almost immediately, but this young buck was farmer strong and he was only getting 3-5 days of use from that string before it would snap on him. When we switched to the 15L ga. of the same string, his service life pretty much doubled and his arm issues continued to improve. He was fine for the rest of that season.
So I trust this string and recommend at least putting it on your short list of considerations. You could start with the 16 ga., but maybe try the 15L ga. to see if it has the combo of softness and durability you want (TW is selling individual sets for $9.00). Keep in mind that the heavier 15L ga. will probably need slightly less tension to get a similar feel as a 16 ga. multi.
Note: Wilson offers sets of 15 ga. Sensation, which is the same 1.35mm ga. as PPC even though the one is labeled "15 ga." and the other "15L ga.". Tecnifibre also sells sets of 1.35mm X-One Biphase.
Many kids (and adults) that I string for get enough softness from syn. gut (SG). I've always used it in my own frames and I recommend it all the time. Keep in mind that they're not all the same. Prince SG with Duraflex is quite stiff - I don't use it in my own racquets. Gosen OG Sheep Micro is also somewhat stiff, but some folks like it. This is a rather durable SG and might bring decent service life along with some softness as long as it isn't installed at a high tension.
Softer SG's include Babolat (their hot pink version is a hit with the girls' team), Volkl Classic, Prince Original, and Kirschbaum. There are others that I'm not too familiar with right now. The softest SG I know is Forten Sweet - this string is soft enough to work as a low cost alternative to many multis. The 17 ga. version isn't too durable, but the 16 ga. offers average service life for a SG. You can get individual sets for $5.00.