Square-X Sharp Set
Square-X Sharp Set
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We selected our popular SQUARE-X string to introduce our first 18g but be careful… this one has an evil bite to it!
The SHARP is our square-shaped string but designed to be thinner with super sharp edges. I can tell you now, that this string will be a nightmare for stringers but a DREAM for players!

This string is a very soft co-polyester and easy on the arm like most of our co-polys.
The SHARP gets an A+ in most departments, effortless power; incredible feel; control, and that “wicked” spin. Obviously, with its sharp edges and being a thin 18g, it’s not your most durable co-poly from our line.
The SHARP is ideal for those players looking to get what feels like “an illegal advantage” when it comes to spin.
If you’ve never played with polyester strings and are not a chronic string breaker, then this is the ideal string to make an easy transition into the world of polyester strings.
Color: Lime Green.
Length: 40ft/12m and 660ft/200m
Gauge: 18 (1.15mm)
Construction: Carbon Co-Polyester
Advantage: Control; Feel and Spin

Quadro and the Square sets are, at least for me, the best combination of feel and spin. As a dude who played in the late 70s and early 80's, I tend to hit the ball flat and very hard. I have been working on gaining more net clearance and this combination has been the best combo. I have tried over 20+ other combinations over the past three months and I'm really happy now.
Love this string. I have now more power and depth on my ground strokes and my second serve. My backhand slice looks quite serious. In addition, my elbow took far less stress than usual. I can highly recommend this string
I play tested this string for about a week or so now and they do exactly as advertised. Soft on the arm but not mushy, actaully its got a nice crisp feel for me ( I did the tension low at 40) and the spin and control are still excellent. I have had elbow and wrist issues and had gone away from Poly strings and finally decided to give this one and 2 of their other strings a try. Quadro Twist ( will review that one separately) also a good string and Hexagon X ( thought this one I would not care for) will review as well next. (My wife Favorite) To Summarize the strings do what they claim and people just need to try them out. I have not noticed a drop off in play at all BTW which for POLY is a great thing. Happy Hitting!
Had to pay 60£ for getting the strings from the post office, for VAT and customs, these costs were never mentioned when submitting the order. I informed Ytex that it’s not normal for the end user to support these unannounced costs, but didn’t receive any response
It may be the "feeliest" poly - but, good heavens, nothing like a multi filament. After a full bed NXT 17g, this "feels" like a piano wire. Strung it at 45 lbs - vs 43 for the NXT. Maybe if dropped to 38, it might be better. This would GIVE you elbow problems.
These strings are great! They are like Hyper G but more comfortable!
These square strings feel illegal and I love them. They make my back hand slice very difficult to return. They definitely give me an edge.